8.3 Microorganisms and viruses

8.3 Microorganisms and viruses

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Question 1 of 14

1. Question
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Which of the following best describes a characteristic of microorganisms?
- Organisms seen by naked eye
- Large land organisms
- Organisms visible only through a microscope
- Large multicellular structures
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Question 2 of 14

2. Question
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What is the main tool used to study microorganisms?
- Telescope
- Microscope
- Binoculars
- Spectroscope
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Question 3 of 14

3. Question
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Which of the following is an example of a microorganism?
- Earthworm
- Virus
- Fish
- Frog
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Question 4 of 14

4. Question
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Which of the following is a bacterium?
- Euglena
- Escherichia coli
- Bacteriophage
- Paramecium
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Question 5 of 14

5. Question
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Which of the following is NOT a bacterium?
- Bacillus sp.
- Spirillum sp.
- Amoeba sp.
- Salmonella sp.
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Question 6 of 14

6. Question
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Why is a bacteriophage not classified as a bacterium?
- Has a cell wall
- Virus that infects bacteria
- Autotrophic bacterium
- Reproduces by binary fission
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Question 7 of 14

7. Question
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What is the main role of decomposers in an ecosystem?
- Produce food via photosynthesis
- Absorb water
- Break down dead organic matter
- Produce oxygen
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Question 8 of 14

8. Question
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What would happen if there were no decomposers?
- Animals could not breathe
- Organic matter would not decompose
- Plants could not bloom
- Roots could not absorb water
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Question 9 of 14

9. Question
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Which of the following is NOT a decomposer?
- Earthworm
- Fungus
- Bacteria
- Green algae
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Question 10 of 14

10. Question
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Which microorganism is used to make bread?
- Lactobacillus sp.
- Penicillium sp.
- Rhizobium sp.
- Saccharomyces sp.
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Question 11 of 14

11. Question
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What is the main role of Rhizobium sp. in agriculture?
- Causes plant disease
- Absorbs CO₂
- Fixes nitrogen into the soil
- Ferments milk
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Question 12 of 14

12. Question
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Which microorganism is used in cheese and yogurt production?
- Spirogyra sp.
- Lactobacillus sp.
- Penicillium sp.
- Clostridium sp.
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Question 13 of 14

13. Question
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Which main feature distinguishes viruses from bacteria?
- Peptidoglycan cell walls
- Reproduce independently
- Reproduce only within host cells
- Contain ribosomes and mitochondria
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Question 14 of 14

14. Question
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Why are viruses not considered fully living organisms?
- Don’t have nucleic acids
- Survive freely anywhere
- Don’t metabolize without a host
- Contain mitochondria
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