COLLEGE OF THE NORTH ATLANTIC BIOLOGY Practice Final Exam

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1 COLLEGE OF THE NORTH ATLANTIC BIOLOGY 1170 Practice Final Exam Students please take note: This exam has been produced and distributed solely as a practice exam. The questions are similar to questions that you will experience on your formal final exam however they will likely not be identical.

2 Question 1: Fill in the blanks (20 marks) a) The tissue that transports sugar in plants is b) The cells of a rose petal have this ploidy c) The term used to describe organisms that obtain both their energy and carbon from organic molecules is d) The process of transferring pollen to the stigma of a flowering plant is called e) The organelle responsible for the production of biological protein is f) The tissue in plants responsible for the production of new xylem is g) The organism Panolis flammea belongs to the species h) Name a disease caused by a virus i) The male gametophyte of a flowering plant is more commonly known as a(n) j) Two digestive enzymes, trypsin and pepsin are composed of monomers termed Page 2 of 10

3 Question 2: Examine the diagram of a virus, and its life cycle, and answer the questions that follow. (8 marks) a. Name the organism that is infected by this virus (1 mark) b. Name Structure A (1 mark) c. Name the macromolecule A is made of (1 mark) d. What is B? (1 mark) e. Several events occur inside the host cell between stages X and Y. Identify two of them i (1 mark) ii (1 mark) f. How does the virus bring about the bursting of the host cell in D? (2 marks) Page 3 of 10

4 Question 2: Nucleic acid function. Examine the following diagram of translation and answer the questions that follow. (10 marks) 1. Name the following molecules (2 marks) Molecule B: Molecule C: 2. Sate the function of molecule A. (2 marks) 3. On the diagram, circle and label an anticodon (2 marks) 4. On the diagram, fill in the six(6) missing nitrogenous bases on molecule B. (2 marks) 5. Give the sequence of six (6) nitrogenous bases on the DNA strand that serve as the template to construct the six (6) base sequence that you filled in for part 4 (2 marks) Page 4 of 10

5 Question 4: For three of the following pairs of terms, define each term and explain one significant biological relationship between them (12 marks). a. Genome / retrovirus b. Pollination / fertilization c. Euglena / locomotion d. Light reaction / Calvin cycle e. Auxin / growth f. Chemoautotroph / Photoautotroph ( ) ( ) ( ) Page 5 of 10

6 Question 5: Answer two (2) of the following questions (10 marks) a) Why is the treatment of bacterial infections often different from that for viral infections? b) Why did plants evolve differently from algae? c) Explain how the origin of mitochondria differs from that of the endoplasmic reticulum. d) Discuss the significance of the endodermis to plant roots. ( ) ( ) Page 6 of 10

7 Question 6: Problems You must answer only two (2) of the following three problems (10 marks each) Problem 1: Water relation in a cell I. What has happened to the cell during the time intervak B-C? Explan II. During the time interval C-D the cell membrane is seen to be pulled away from the wall in several places. What term is used to describe this condition in a cell? III. During what time interval is the solute within the cell most concentrated? Explain. IV. At time D the solution is changed. Is the solution hypertonic or hypotonic to the cell? Explain by reference to the graph. Page 7 of 10

8 You must answer only two of the three problems. Problem 2: Guard cell function and transpiration Examine the two graphs below and answer the questions that follow. I. Describe, do not explain, what happens to light intensity over the 24-hr cycle (graph on the left) II. Describe, do not explain, what happens to the size of stomatal openings over the 24-hour cycle (graph on the right) III. Using your knowledge of Guard Cell Function, explain the relationship between the variation in stomatal opening and light intensity. IV Explain how transpiration is affected by wind speed. Page 8 of 10

9 YOU MUST ANSWER ONLY TWO OF THREE PROBLEMS Problem 3. Photosynthesis and Respiration An experimenter filled three flasks (A,B and C) with a growth medium. To one flask, a population of an autotrophic protest was added. To another flask, a population of a heterotrophic protest was added. To the third flask no organisms were added. The flasks were sealed and the O 2 concentration was measured every 15 minutes. All flasks were exposed to light for 3 hours followed by a 3-hour period of darkness. The results are presented in the graph below. a) Which flask contains the autotrophic protest? _ (1 mark) b) For the autotroph, compare the rate of photosynthesis for the period when the light was on with the period when the light was off. (2 marks) c) For the autotroph, compare the rate of respiration for the period when the light is on with the period when the light was off. (1 mark) d) Which flask contains the heterotrophic protest? (1 mark) e) For the hertotroph, compare the rate of respiration for the period when the light is on with the period when the light was off. (1 mark) (f) Which flask is the control? (1 mark) (g) How are you able to identify that flask as the control? (3 marks) Page 9 of 10

10 Question 7: Multiple Choice. CLEARLY indicate the Best answer for each question. (20 marks) 1. The pressure which causes bulk flow within the phloem during sugar transport results from: a. Root pressure b. The osmotic uptake of water by sieve tubes at the source c. The accumulation of minerals and water by the stele in the root d. The osmotic uptake of water by sieve tubes in the sink e. Hydrostatic pressure in the xylem cells 2. What are bacteria that are poisoned by Oxygen called? a. aerobes b. obligate anaerobes c. cyanobacteria d. aestivating bacteria e. facultative anaerobes 3. A mutation will result in an altered protein structure when a. A base is substituted b. A base is added or deleted c. Two bases switch places d. Altered protein structures do not result from mutations e. Mutation always results in altered protein structure 4. The primary function of cellular respiration is to a. Produce CO2 for photosynthesis b. Produce ATP for cellular work c. Use ATP to produce glucose d. Exchange gasses e. To use Oxygen to create energy 5. Inside a leaf, Carbon Dioxide moves from the air spaces into the mesophyll cells because a. There is a higher concentration of Carbon Dioxide in the cell b. The concentration gradient directs diffusion in that direction c. There is bulk flow of carbonic acid in the xylem d. There is a lower concentration of Oxygen in the cells e. Carbon Dioxide is actively transported into the cells Page 10 of 10

13. The diagram below shows two different kinds of substances, A and B, entering a cell.

13. The diagram below shows two different kinds of substances, A and B, entering a cell. Name 1. In the binomial system of nomenclature, which two classification groups provide the scientific name of an organism? A) kingdom and phylum B) phylum and species C) kingdom and genus D) genus and