Topic 1.1 Characteristics of Living Things
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1 Science 8 Unit 1 Worksheet Topic 1.1 Characteristics of Living Things DIRECTIONS: In the textbook, read Unit 1 Topics 1.1, 1.2, and 1.3. Once you are done, answer the questions below. To check your understanding of this unit, you may complete the Topic Reviews on pages 13, 21, and What is the definition of a cell? The basic structural and functional unit of life. 2. All living things are made of one or more cells. 3. What are two examples of single-celled organisms? Bacteria, euglena or paramecium 4. List five multi-cellular organisms. Answers will vary. Examples are bear, dog, human, snake, owl, etc. 5. Why do living things need to take in nutrients? Because they can't make nutrients themselves. 6. What is the difference between a consumer and a producer? Consumers eat organisms for food, whereas, producers produce their own food using the sun's energy and nutrients from their surroundings. 7. What is cellular respiration? A chemical reaction in the cells of most organisms that releases the energy needed to carry out life's processes. 8. List three ways that unicellular and multicellular living things similar and three ways they are different. Similar: take in nutrients, both are living things, both have structures that store and remove waste Different: unicellular organisms only have one cell. Unicellular organisms remove waste by it passing across the outer membrane of the cell or using a vesicle to expel, whereas, multicellular organisms have structures/systems that collect and remove waste; ex. Kidneys filter waste from blood and excrete it in the urine. ProActive Curriculum Ltd. Rev: 9/4/2018 Page 1 of 5
2 9. Why do living things need energy? They need energy in order to carry out life processes. 10. What is the definition of a stimulus? Anything that causes a living thing to react or respond in a certain way. 11. What do multicellular organisms have to help them respond to stimuli? Organs and/or nervous system 12. How does "growing" differ between a multicellular and a unicellular organism? Unicellular organisms grow by increasing in cell size. Multicellular organisms grow by increasing the number of cells in their body. 13. How is growing different than reproducing? Growing is increasing in size or in the number of cells, or both. Reproducing is making more of the organisms' own kind of species. Topic 1.2 Where do Living Things Come From? 1. The theory in biology that explains the structure and source of all living things is called the cell theory. 2. What three statements make up the cell theory? All living things are made of one or more cells All new cells come from pre-existing cells The cell is the basic unit of life 3. A strand of genetic material surrounded by a layer of protein is called a virus. 4. How do viruses work? They infect and reproduce inside a host cell. 5. Why aren't viruses considered living things by many scientists? They can't take in nutrients, use energy, or reproduce on their own. ProActive Curriculum Ltd. Rev: 9/4/2018 Page 2 of 5
3 Topic 1.3 How are Cells Different From Each Other? 1. The two main types of cells are prokaryotic and eukaryotic cells. 2. Complete the chart to compare and contrast prokaryotic and eukaryotic cells. Prokaryotic only Similar Eukaryotic only No nucleus Carry out all processes needed to stay alive Nucleus Small Cell membrane Organelles No organelles Big and complex Cell wall 3. Bacteria is a type of prokaryotic cell. 4. Some bacteria use their flagella to move. 5. List two differences and two similarities between archaea and bacteria: Differences Similarities The molecules found in archaea are more similar to those found in eukaryotic cells. Both have no nucleus Molecules in archaea cytoplasm are not found in any other organism. Both have a cell wall ProActive Curriculum Ltd. Rev: 9/4/2018 Page 3 of 5
4 6. Match the cell organelle to its structure and function: B 1. Cell membrane A. Tough, rigid structure C 2. Nucleus B. Surrounds and protects the contents of the cell F 3. Cytoplasm C. Contains the genetic material that controls a cell's growth A 4. Cell wall D. Bean-shaped structures that release energy from food G 5. Vesicles E. Use energy from the sun to produce sugar for plants D 6. Mitochondria F. Jelly-like fluid in which internal organelles float H 7. Vacuoles G. Small sacs that transport materials E 8. Chloroplasts H. Smaller and more numerous in animal cells 7. In the space provided below write the name of each of the indicated eukaryotic cell features. A B C D E F G H Cell membrane Cytoplasm Cell wall Nucleus Vacuoles Mitochondria Chloroplasts Vesicles ProActive Curriculum Ltd. Rev: 9/4/2018 Page 4 of 5
5 8. Plant cells have structures that animal cells do not have, such as cell wall, large vacuole, and chloroplast. 9. Chloroplasts use the sun's energy to change CO 2 and H 2O into sugar and oxygen. 10. Plants use the sugar produced by photosynthesis as food. The O 2 produced is released into the air. 11. In animal cells, the cell membrane controls what comes in and goes out of the cell. 12. Mitochondria play an important role in cellular respiration. 13. Cellular respiration is a chemical reaction in which sugar and oxygen in cells is changed into CO 2 and H 2O, which are the waste by-products of cellular respiration. ProActive Curriculum Ltd. Rev: 9/4/2018 Page 5 of 5
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