Prokaryotes & Viruses. Multiple Choice Review. Slide 2 / 47. Slide 1 / 47. Slide 3 (Answer) / 47. Slide 3 / 47. Slide 4 / 47. Slide 4 (Answer) / 47

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1 Slide 1 / 47 Slide 2 / 47 New Jersey enter for Teaching and Learning Progressive Science Initiative This material is made freely available at and is intended for the non-commercial use of students and teachers. These materials may not be used for any commercial purpose without the written permission of the owners. NJTL maintains its website for the convenience of teachers who wish to make their work available to other teachers, participate in a virtual professional learning community, and/or provide access to course materials to parents, students and others. Prokaryotes & Viruses Multiple hoice Review lick to go to website: Slide 3 / 47 1 Prokaryotes consist of both bacteria and archaea. Which of the following statements best characterize these types of organisms? Slide 3 (nswer) / 47 1 Prokaryotes consist of both bacteria and archaea. Which of the following statements best characterize these types of organisms? acteria are considered living, however archaea are oth bacteria and archaea meet all the characteristi life. rchaea are considered living, however bacteria are Neither are considered to be complete, living organ nswer acteria are considered living, however archaea are oth bacteria and archaea meet all the characteristi life. rchaea are considered living, however bacteria are Neither are considered to be complete, living organ Slide 4 / 47 2 Which of the following correctly states the relationship(s) between bacteria and humans? Slide 4 (nswer) / 47 2 Which of the following correctly states the relationship(s) between bacteria and humans? Some bacteria act as catalysts in chemical reactions of human cells. ll bacteria are harmful to humans in some way. Some bacteria assist humans in digesting food. ll of the above are true. Some bacteria act as catalysts in chemical reactions of human cells. nswer ll bacteria are harmful to humans in some way. Some bacteria assist humans in digesting food. ll of the above are true.

2 Slide 5 / 47 3 The image below is a representation of the relationships of bacteria, archaea and eukaryotes. Which of the following correctly describes the relationship between these three domains? Slide 5 (nswer) / 47 3 The image below is a representation of the relationships of bacteria, archaea and eukaryotes. Which of the following correctly describes the relationship between these three domains? nswer Eukaryotes and bacteria are more closely related than eukaryotes and archaea. acteria and archaea are both related to eukaryotes, which bacteria being more closely related to eukaryotes. acteria and archaea are both related to eukaryotes, with archaea being more closely related to eukaryotes. acteria and archaea are considered non-living, therefore are not closely related to eukaryotes. Slide 6 / 47 4 The image below is of a prokaryote called staphylococcus. ased upon the characteristics of prokaryotes, which of the following correctly describes what we see in this image? Eukaryotes and bacteria are more closely [This object related is a pull tab] than eukaryotes and archaea. acteria and archaea are both related to eukaryotes, which bacteria being more closely related to eukaryotes. acteria and archaea are both related to eukaryotes, with archaea being more closely related to eukaryotes. acteria and archaea are considered non-living, therefore are not closely related to eukaryotes. Slide 6 (nswer) / 47 4 The image below is of a prokaryote called staphylococcus. ased upon the characteristics of prokaryotes, which of the following correctly describes what we see in this image? nswer Prokaryotes may be multicellular or unicellular, therefore this is a single prokaryotic organism. acteria are only unicellular but archaea may be multicellular, therefore this represents and archaea. Prokaryotes are unicellular but may form colonies, therefore this is a unicellular, prokaryotic colony. This is a eukaryotic organism as all prokaryotes are unicellular and cannot form colonies. Slide 7 / 47 Prokaryotes may be multicellular or unicellular, therefore this is a single prokaryotic organism. acteria are only unicellular but archaea may be multicellular, therefore this represents and archaea. Prokaryotes are unicellular but may form colonies, therefore this is a unicellular, prokaryotic colony. This is a eukaryotic organism as all prokaryotes are unicellular and cannot form colonies. Slide 7 (nswer) / 47 5 Which of the statements below correctly describes prokaryotic cells? 5 Which of the statements below correctly describes prokaryotic cells? Prokaryotic cells are less complex than eukaryotic c and do not contain separate organelles. Prokaryotic cells are more complex than eukaryotic and contain all of the same cellular organelles. Prokaryotic cells share similarities with eukaryotic c by containing a nucleus, ribosomes and plasmids. Prokaryotic cells share similarities with eukaryotic c by containing ribosomes and N within a cell mem Prokaryotic cells are less complex than eukaryotic c and do not contain separate organelles. Prokaryotic cells are more complex than eukaryotic and contain all of the same cellular organelles. Prokaryotic cells share similarities with eukaryotic c by containing a nucleus, ribosomes [This object is a pull and tab] plasmids. nswer Prokaryotic cells share similarities with eukaryotic c by containing ribosomes and N within a cell mem

3 Slide 8 / 47 6 acterial cells have a carbohydrate cell wall and many also have a capsule. How do these structures function in bacteria? Slide 8 (nswer) / 47 6 acterial cells have a carbohydrate cell wall and many also have a capsule. How do these structures function in bacteria? These two structures replace the cell membrane in bacterial cells. These two structures both function in protection for bacterial cell. The cell wall protects the bacterial cell while the cap produces food. The capsule provides protection while the cell wall replaces the cell membrane. These two structures replace the cell membrane in bacterial cells. These two structures both function in protection for bacterial cell. The cell wall protects the bacterial cell while the cap produces food. nswer The capsule provides protection while the cell wall replaces the cell membrane. Slide 9 / 47 7 Many prokaryotes demonstrate taxis, mainly through the use of flagella. How do these bacteria utilize phototaxis? Slide 9 (nswer) / 47 7 Many prokaryotes demonstrate taxis, mainly through the use of flagella. How do these bacteria utilize phototaxis? acteria utilize phototaxis to move towards or away chemical stimuli. acteria utilize phototaxis to move towards or away light, often for photosynthesis. acteria utilize phototaxis only to move away from l prevent temperature increases. acteria utilize phototaxis only to locate other bacte reproduction purposes. acteria utilize phototaxis to move towards or away chemical stimuli. acteria utilize phototaxis to move towards or away light, often for photosynthesis. acteria utilize phototaxis only to move away from l prevent temperature increases. nswer acteria utilize phototaxis only to locate other bacte reproduction purposes. Slide 10 / 47 8 Plasmids are small circular pieces of N found within certain cells. How does the F plasmid benefit an organism? Slide 10 (nswer) / 47 8 Plasmids are small circular pieces of N found within certain cells. How does the F plasmid benefit an organism? The F plasmid benefits prokaryotes by providing resistance to some antibiotics. The F plasmid benefits prokaryotes by producing a that allows for movement. The F plasmid benefits both prokaryotes and eukary by increasing genetic variability. The F plasmid benefits prokaryotes by enabling the production of a sex pilus, increasing genetic variab The F plasmid benefits prokaryotes by providing resistance to some antibiotics. The F plasmid benefits prokaryotes by producing a that allows for movement. The F plasmid benefits both prokaryotes and eukary by increasing genetic variability. nswer The F plasmid benefits prokaryotes by enabling the production of a sex pilus, increasing genetic variab

4 Slide 11 / 47 9 Plasmids are small circular pieces of N found within certain cells. How does the R plasmid benefit prokaryotes? Slide 11 (nswer) / 47 9 Plasmids are small circular pieces of N found within certain cells. How does the R plasmid benefit prokaryotes? R plasmids provide a bacterial cell with resistance t sexual reproduction, ensuring only identical offsprin R plasmids provide a bacterial cell with resistance t certain antibiotics, increasing chances for survival. R plasmids provide antibiotic resistance for both prokaryotic and eukaryotic cells, increasing cell sur R plasmids allow for the production of ribosomes, w make proteins for the prokaryotic cell. R plasmids provide a bacterial cell with resistance t sexual reproduction, ensuring only identical offsprin R plasmids provide a bacterial cell with resistance t certain antibiotics, increasing chances for survival. R plasmids provide antibiotic resistance for both prokaryotic and eukaryotic cells, increasing cell sur nswer R plasmids allow for the production of ribosomes, w make proteins for the prokaryotic cell. Slide 12 / If we assume that a bacterium can double every hour and all of the bacteria survive and reproduce at the same rate, how long will it take for one bacteria to reproduce into 1,000 bacteria? Slide 12 (nswer) / If we assume that a bacterium can double every hour and all of the bacteria survive and reproduce at the same rate, how long will it take for one bacteria to reproduce into 1,000 bacteria? pproximately 11 hours pproximately 10 hours nswer pproximately 11 hours pproximately 10 hours pproximately 24 hours pproximately 24 hours pproximately 1000 hours pproximately 1000 hours Slide 13 / 47 Slide 14 / 47 The graph below represents the bacterial growth over a period of time for a specific bacterial species. Use this graph to answer questions 11 and What is the pattern of bacterial reproduction as shown in the graph above? The bacterial population doubles every 20 minutes. The bacterial population increases by 20 cells every minutes. The bacterial population increases by 20 from 0 to 2 minutes then rises exponentially. The bacterial population triples every 20 minutes.

5 Slide 14 (nswer) / What is the pattern of bacterial reproduction as shown in the graph above? The bacterial population doubles every 20 minutes. The bacterial population increases by 20 cells every minutes. nswer The bacterial population increases by 20 from 0 to 2 minutes then rises exponentially. The bacterial population triples every 20 minutes. Slide 15 / ssuming that the same pattern of bacterial reproduction continues, what can we project the bacterial population to be after another 60 minutes? 10,240 bacteria 81,920 bacteria 163,840 bacteria 40,960 bacteria Slide 15 (nswer) / ssuming that the same pattern of bacterial reproduction continues, what can we project the bacterial population to be after another 60 minutes? Slide 16 / omparing and contrasting the process of transcription found within eukaryotic cells and prokaryotic cells, which of the following statements are accurate? nswer 10,240 bacteria 81,920 bacteria 163,840 bacteria 40,960 bacteria Transcription occurs in both eukaryotic and prokary cells. Transcription occurs in the nucleus of both cell type Most prokaryotic cells perform translation only, onl perform transcription. Transcription utilizes N to produce RN, but the prokaryotes is only single stranded. Slide 16 (nswer) / omparing and contrasting the process of transcription found within eukaryotic cells and prokaryotic cells, which of the following statements are accurate? Slide 17 / 47 The image below represents a particular section of a prokaryotic chromosome. Utilize this image to respond to questions 14 and 15 below: Transcription occurs in both eukaryotic and prokary cells. Transcription occurs in the nucleus of both cell type Most prokaryotic cells perform translation only, onl perform transcription. nswer Transcription utilizes N to produce RN, but the prokaryotes is only single stranded.

6 Slide 18 / What is the role of the operator, as seen in the image above? Slide 18 (nswer) / What is the role of the operator, as seen in the image above? The operator is where the RN polymerase binds. The operator is direct coding for the amino acid with protein. The operator alone determines whether or not the p will be produced. The operator acts as an on/off switch. The operator is where the RN polymerase binds. The operator is direct coding for the amino acid with protein. nswer The operator alone determines whether or not the p will be produced. The operator acts as an on/off [This object switch. is a pull tab] Slide 19 / What is the role of the promoter, as seen in the image above? Slide 19 (nswer) / What is the role of the promoter, as seen in the image above? The promoter indicates where translation will begin The promoter acts alone as the on/off switch. The promoter attracts the RN polymerase to the molecule. The promoter destroys the RN polymerase so that transcription can occur. The promoter indicates where translation will begin The promoter acts alone as the on/off switch. nswer The promoter attracts the RN polymerase to the molecule. The promoter destroys the RN polymerase so that transcription can occur. Slide 20 / acteria and humans can have different types of relationships based upon who benefits and who does not. Which of the following describes a mutualistic benefit between bacteria and humans? One type of bacteria enables further digestion of foods within the human intestine, while using this food as its own food source. One type of bacteria can cause mild infections within human sinuses, without benefitting humans. One type of bacteria lives on human skin digesting materials found there, causing an infection in humans if the skin is broken. One type of bacteria provides plasmids for human N research, but is destroyed in the process. Slide 20 (nswer) / acteria and humans can have different types of relationships based upon who benefits and who does not. Which of the following describes a mutualistic benefit between bacteria and humans? One type of bacteria enables further digestion of foods within the human intestine, while using this food as its own food source. One type of bacteria can cause mild infections within human sinuses, without benefitting humans. nswer One type of bacteria lives on human skin digesting materials found there, causing an infection in humans if the skin is broken. One type of bacteria provides plasmids for human N research, but is destroyed in the process.

7 Slide 21 / Which of the following correctly describes of binary fission? Slide 21 (nswer) / Which of the following correctly describes of binary fission? sex pili is formed where genetic information is transferred from one bacteria to another. inary fission produces two copies of the parent cell, each with half the parental N. inary fission increases the genetic variation of the bacterial colony. The chromosome is replicated then the cell divides producing two exact copies of the parent cell. sex pili is formed where genetic information is transferred from one bacteria to another. inary fission produces two copies of the parent cell, each with half the parental N. inary fission increases the genetic variation of the bacterial colony. nswer The chromosome is replicated then the cell divides producing two exact copies of the parent cell. Slide 22 / ll prokaryotes contain the genetic information required to produce a new prokaryotic cell. Which of the following correctly describes prokaryotic N? Slide 22 (nswer) / ll prokaryotes contain the genetic information required to produce a new prokaryotic cell. Which of the following correctly describes prokaryotic N? Prokaryotic N has the same molecular structure as human N; a double helix with sugars, phosphate groups and nitrogenous bases. Prokaryotic N is similar to human RN; it is single stranded with sugars, phosphate groups and nitrogenous bases. Prokaryotic N is very different from human N; it has a different type of sugar, no phosphate group and entirely different nitrogenous bases. Prokaryotic N is exactly the same as human N; it has the same molecular structure and the genes are located on numerous chromosomes. Slide 23 / 47 Prokaryotic N has the same molecular structure as human N; a double helix with sugars, phosphate groups and nitrogenous bases. Prokaryotic N is similar to human RN; it is single stranded with sugars, phosphate groups and nitrogenous bases. Prokaryotic N is very different from human N; it has a different type of sugar, no phosphate group and entirely different nitrogenous bases. nswer Prokaryotic N is exactly the same as human N; it has the same molecular structure and the genes are located on numerous chromosomes. Slide 24 / 47 The image below illustrates the major steps of Griffith s experiments regarding transformation of cells. Use this image to respond to questions 19 and 20 below. 19 Frederick Griffith took the S (smooth) strain of bacteria from the dead mice seen in panel above. He then killed the bacteria using heat. Why, then, were the mice in panel able to survive? The mice had developed a resistance to the S strain bacteria so they could not be affected. The heat killed S strain could not produce any prod nor reproduce in order to affect the mice. The heat killed S strain bacteria were non-pathogen begin with. The heat killed S strain shared the genetic informati with mouse cells, causing the mouse to resist the d

8 Slide 24 (nswer) / Frederick Griffith took the S (smooth) strain of bacteria from the dead mice seen in panel above. He then killed the bacteria using heat. Why, then, were the mice in panel able to survive? The mice had developed a resistance to the S strain bacteria so they could not be affected. The heat killed S strain could not produce any prod nor reproduce in order to affect the mice. nswer The heat killed S strain bacteria were non-pathogen begin with. The heat killed S strain shared the genetic informati with mouse cells, causing the mouse to resist the d Slide 25 (nswer) / How was the heat killed S strain able to affect the R bacterial strain, resulting in mouse death, as seen in panel above? Slide 25 / How was the heat killed S strain able to affect the R bacterial strain, resulting in mouse death, as seen in panel above? The heat killed S strain bacteria infected a virus whi then infected the mouse cells, killing the mice. Some of the heated S strain bacteria survived the he reproduced quickly, and killed the mice. The R strain bacteria took in pieces of the heat kille bacterial N, transforming the R strain into S strai bacteria. The R strain bacteria were transformed by toxins produced by the heat killed S strain, causing the R s to become pathogenic. Slide 26 / 47 The illustration below represents a process that can be performed by certain prokaryotic cells. Use this illustration to respond to questions 21 and 22. The heat killed S strain bacteria infected a virus whi then infected the mouse cells, killing the mice. Some of the heated S strain bacteria survived the he reproduced quickly, and killed the mice. The R strain bacteria took in pieces of the heat kille bacterial N, transforming the R strain into S strai bacteria. nswer The R strain bacteria were transformed by toxins produced by the heat killed S strain, causing the R s to become pathogenic. Slide 27 / The process in the image above results in the direct transfer of genetic material. Which of the following correctly describes or identifies the process within this image? This process is known as conjugation. The transfer of genetic information goes both ways. This process is a type of binary fission. oth prokaryotic and eukaryotic cells can perform t process. Slide 27 (nswer) / The process in the image above results in the direct transfer of genetic material. Which of the following correctly describes or identifies the process within this image? This process is known as conjugation. The transfer of genetic information goes both ways. This process is a type of binary fission. nswer oth prokaryotic and eukaryotic cells can perform t process.

9 Slide 28 / The small piece of genetic information that is transferred is usually the. Slide 28 (nswer) / The small piece of genetic information that is transferred is usually the. large circular chromosome chromosome #1 RN segment plasmid large circular chromosome chromosome #1 RN segment plasmid nswer Slide 29 / Viruses are small particles that infect living organisms. re the considered to be living? Why, why not? Slide 29 (nswer) / Viruses are small particles that infect living organisms. re the considered to be living? Why, why not? Viruses are considered to be living because they are composed of cells and cell organelles. Viruses are not considered to be living because the cannot process energy on their own. Viruses are not considered to be living because the not carry any genetic material. Viruses are considered to be living because some c photosynthesize. Viruses are considered to be living because they are composed of cells and cell organelles. Viruses are not considered to be living because the cannot process energy on their own. Viruses are not considered [This to object be is living a pull tab] because the not carry any genetic material. nswer Viruses are considered to be living because some c photosynthesize. Slide 30 / Which of the following are characteristics of viruses? Slide 30 (nswer) / Which of the following are characteristics of viruses? They can infect all types of cells. They always kill the host cell releases multiple new viruses. They use molecules and cell organelles from the ho to reproduce. They can only infect eukaryotic cells. They can infect all types of cells. They always kill the host cell releases multiple new viruses. nswer They use molecules and cell organelles from the ho to reproduce. They can only infect eukaryotic cells.

10 Slide 31 / elow is a list of steps associated with one type of life cycle of a phage. Put the steps in order. i. The particle releases its genetic instructions into the host cell. ii. The new particles break free from the host cell. iii. virus particle attaches to a host cell. iv. The injected genetic material recruits the host cell's enzymes. v. The enzymes make parts for more new virus particles. vi. The new particles assemble the parts into new viruses. i, ii, iii, iv, v, vi vi, i, ii, v, iii, iv Slide 31 (nswer) / elow is a list of steps associated with one type of life cycle of a phage. Put the steps in order. i. The particle releases its genetic instructions into the host cell. ii. The new particles break free from the host cell. iii. virus particle attaches to a host cell. iv. The injected genetic material recruits the host cell's enzymes. v. The enzymes make parts for more new virus particles. vi. The new particles assemble the parts into new viruses. nswer i, ii, iii, iv, v, vi vi, i, ii, v, iii, iv ii, iv, vi, I, ii, iii ii, iv, vi, I, ii, iii iii, I, iv, v, vi, ii iii, I, iv, v, vi, ii Slide 32 / Which type of life cycle of a bacteriophage is most immediately harmful to the bacterial cell and why? Slide 32 (nswer) / Which type of life cycle of a bacteriophage is most immediately harmful to the bacterial cell and why? The lytic cycle because the new viruses are immediately produced and the host cell is killed. The lysogenic cycle because the new viruses are immediately produced and the host cell is killed. The lytic phase because the viral N is immediate incorporated into the bacterial N. The lysogenic phase because the viral N is immediately incorporated into the bacterial N. The lytic cycle because the new viruses are immediately produced and the host cell is killed. The lysogenic cycle because the new viruses are immediately produced and the host cell is killed. The lytic phase because the viral N is immediate incorporated into the bacterial N. nswer The lysogenic phase because the viral N is immediately incorporated into the bacterial N. Slide 33 / Temperate phages are unique because they are able to Slide 33 (nswer) / Temperate phages are unique because they are able to utilize only the lysogenic cycle utilize only the lysogenic cycle utilize only the lytic cycle utilize the transducive cycle nswer utilize only the lytic cycle utilize the transducive cycle utilize both the lysogenic and lytic cycles utilize both the lysogenic and lytic cycles

11 Slide 34 / 47 The illustration below represents a process whereby new viruses are produced and potentially new bacterial N is added to bacterial cells. Use this illustration to answer questions 28 and 29. Slide 35 / The steps of the process shown above are labeled 1 through 5. Which of the following represents the caption that is best used for step3? acteriophage enzymes break apart bacterial cell The bacterial cell is infected with viral genetic mater The bacterial cell synthesizes new phages that inco both viral N and bacterial N Viruses with both viral genetic material and bacteria infect a new cell. Slide 35 (nswer) / 47 Slide 36 / The steps of the process shown above are labeled 1 through 5. Which of the following represents the caption that is best used for step3? 29 Steps 1 through 3 in the illustration above are the same steps as those found in which life cycle of bacteriophages? acteriophage enzymes break apart bacterial cell The bacterial cell is infected with viral genetic mater nswer The bacterial cell synthesizes new phages that inco both viral N and bacterial N Viruses with both viral genetic material and bacteria infect a new cell. the lytic cycle the lysogenic cycle both the lytic and lysogenic cycles the translation cycle Slide 36 (nswer) / 47 Slide 37 / Steps 1 through 3 in the illustration above are the same steps as those found in which life cycle of bacteriophages? 30 Many archaea are considered to be extremophiles. What characteristic do these organisms have that results in this designation? the lytic cycle nswer the lysogenic cycle both the lytic and lysogenic cycles the translation cycle These organisms have been found in extreme sizes These organisms have been found in extreme temperatures, ph, and high salt. These organisms have been able to withstand extre heights in the earth s atmosphere. These organisms developed extremely early in earth history, before bacteria.

12 Slide 37 (nswer) / Many archaea are considered to be extremophiles. What characteristic do these organisms have that results in this designation? These organisms have been found in extreme sizes These organisms have been found in extreme temperatures, ph, and high salt. These organisms have been able to withstand extre heights in the earth s atmosphere. nswer These organisms developed extremely early in earth history, before bacteria. Slide 38 / gram stain test can be performed using bacteria cells. If the bacteria, as a result of this test, retain a purple color what can we conclude about this type of bacteria? The bacteria is gram-negative and has a thick peptidoglycan layer. The bacteria is gram-negative and has a thin peptidoglycan layer. The bacteria is gram-positive and has a thin peptido layer. The bacteria is gram-positive and has a thick peptidoglycan layer. Slide 38 (nswer) / gram stain test can be performed using bacteria cells. If the bacteria, as a result of this test, retain a purple color what can we conclude about this type of bacteria? The bacteria is gram-negative and has a thick peptidoglycan layer. nswer The bacteria is gram-negative and has a thin peptidoglycan layer. The bacteria is gram-positive and has a thin peptido layer. The bacteria is gram-positive and has a thick peptidoglycan layer. Slide 39 / Some bacteria are more susceptible to antibiotics because of their external structure. Which type of bacteria is more susceptible? Gram-negative bacteria Gram-positive bacteria oth gram-negative and gram-positive are equally susceptible. Gram-indeterminate Slide 39 (nswer) / Some bacteria are more susceptible to antibiotics because of their external structure. Which type of bacteria is more susceptible? Gram-negative bacteria Gram-positive bacteria nswer oth gram-negative and gram-positive are equally susceptible. Gram-indeterminate Slide 40 / acterial N has a circular structure. How does this affect N replication in bacterial cells? n operon must be present in order for N replica take place. N polymerase is not required because of the circ nature of bacterial N. Two N Polymerase molecules attach and replicat moves in one direction. replication bubble must form because there is no open end to the N strand.

13 Slide 40 (nswer) / acterial N has a circular structure. How does this affect N replication in bacterial cells? n operon must be present in order for N replica take place. N polymerase is not required because of the circ nature of bacterial N. Two N Polymerase molecules attach and replicat moves in one direction. nswer replication bubble must form because there is no open end to the N strand. Slide 41 (nswer) / Prokaryotes have a small amount of N when compared to eukaryotic cells. How does this fact often lead to mutualism between bacterial cells? Slide 41 / Prokaryotes have a small amount of N when compared to eukaryotic cells. How does this fact often lead to mutualism between bacterial cells? ifferent species of bacterial cells living in the same environment can join forces to block invaders. Each species of bacteria can produce particular pro that can be absorbed and benefit all bacteria living w the same area. One species of bacteria can colonize another specie bacteria and take over the protein production mech Some bacterial cells are eukaryotic and therefore ca produce more proteins; prokaryotic bacteria benefit the eukaryotic bacteria. Slide 42 / Which characteristic of viruses lead most directly to them being called obligate intracellular parasites? ifferent species of bacterial cells living in the same environment can join forces to block invaders. nswer Each species of bacteria can produce particular pro that can be absorbed and benefit all bacteria living w the same area. One species of bacteria can colonize another specie bacteria and take over the protein production mech Some bacterial cells are eukaryotic and therefore ca produce more proteins; prokaryotic bacteria benefit the eukaryotic bacteria. Slide 42 (nswer) / Which characteristic of viruses lead most directly to them being called obligate intracellular parasites? The fact that viruses are not cells. Viruses attach to bacterial cells utilizing the food pr from photosynthesis. Viruses must infect another species of virus in orde reproduce. nswer Viruses cannot reproduce on their own but must inf reproduce harming the host cell. The fact that viruses are not cells. Viruses attach to bacterial cells utilizing the food pr from photosynthesis. Viruses must infect another species of virus in orde reproduce. Viruses cannot reproduce on their own but must inf reproduce harming the host cell. Slide 43 / wide variety of antibiotics have been discovered in nature and used by humans to destroy pathogenic bacteria. Where were most of these antibiotics discovered? Most were discovered within bacteria cells, which u them as protection against other bacterial cells. Most were discovered within viral cells, which use t break open bacterial cells. Most were discovered within eukaryotic cells, which them to fight off fungi. Most were discovered within plants, which use them establish ground territory.

14 Slide 43 (nswer) / wide variety of antibiotics have been discovered in nature and used by humans to destroy pathogenic bacteria. Where were most of these antibiotics discovered? Most were discovered within bacteria cells, which u them as protection against other bacterial cells. Most were discovered within viral cells, which use t break open bacterial cells. Most were discovered within eukaryotic cells, which them to fight off fungi. nswer Most were discovered within plants, which use them establish ground territory. Slide 44 / How do transcription and translation differ between prokaryotic and eukaryotic cells? The processes of transcription and translation in prokaryotes result in sugars being produced rather proteins. In prokaryotic cells both transcription and translatio occur in the nucleus. In prokaryotic cells both transcription and translatio occur in the cytoplasm. In eukaryotic cells sugars are the result of these processes, while in prokaryotes proteins are the res Slide 44 (nswer) / How do transcription and translation differ between prokaryotic and eukaryotic cells? The processes of transcription and translation in prokaryotes result in sugars being produced rather proteins. In prokaryotic cells both transcription and translatio occur in the nucleus. In prokaryotic cells both transcription and translatio occur in the cytoplasm. nswer In eukaryotic cells sugars are the result of these processes, while in prokaryotes proteins are the res Slide 45 (nswer) / Methicillin-resistant Staphylococcus aureus is just like any other staph bacteria. The difference is, this strain is particularly virulent. MRS bacteria are able to divide every 15 minutes, at body temperature conditions. man has an open cut on his hand, which is exposed to 100 MRS bacteria from equipment at his gym. He does not wash his hand until he reaches home 3 ½ hours later. Estimate how many MRS bacterial cells are embedded inside of his cut by the time he washes his hands. 819,200 16,384 1,638,400 1,024,000 nswer Slide 45 / Methicillin-resistant Staphylococcus aureus is just like any other staph bacteria. The difference is, this strain is particularly virulent. MRS bacteria are able to divide every 15 minutes, at body temperature conditions. man has an open cut on his hand, which is exposed to 100 MRS bacteria from equipment at his gym. He does not wash his hand until he reaches home 3 ½ hours later. Estimate how many MRS bacterial cells are embedded inside of his cut by the time he washes his hands. 819,200 16,384 1,638,400 1,024,000 Slide 46 / Mycobacterium tuberculosis is the bacteria that can cause tuberculosis. This bacillus bacteria spreads slowly and widely in the lungs. The generation time for the bacteria is 12 hours. woman becomes infected with 200 bacteria but does not show any symptoms of illness for 15 days. Estimate the number of bacteria present by the time the woman has noticed any symptoms x 109 bacteria 2.15 x 1011 bacteria 600 bacteria 6.00 x bacteria

15 Slide 46 (nswer) / Mycobacterium tuberculosis is the bacteria that can cause tuberculosis. This bacillus bacteria spreads slowly and widely in the lungs. The generation time for the bacteria is 12 hours. woman becomes infected with 200 bacteria but does not show any symptoms of illness for 15 days. Estimate the number of bacteria present by the time the woman has noticed any symptoms x 109 bacteria 2.15 x 1011 bacteria 600 bacteria nswer 6.00 x bacteria Slide 47 / Serial dilution is often used in the study of bacterial cultures. ultures can become so concentrated that they are difficult to observe when plated onto a petri dish. y how much is the amount of bacterial cells typically reduced for each dilution? 5% 50% 1% 10% Slide 47 (nswer) / Serial dilution is often used in the study of bacterial cultures. ultures can become so concentrated that they are difficult to observe when plated onto a petri dish. y how much is the amount of bacterial cells typically reduced for each dilution? 5% nswer 50% 1% 10%