Virus replication

Last updated: 17/02/2022

AQA A-Level Biology All cells arise from other cells Virus replication

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Question 1 of 19

1. Question
Which of the following is true?
- Viruses can only replicate in a host cell
- Viruses can replicate in fresh water
- Viruses replicate by binary fission
- Viruses replicate by mitosis
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Question 2 of 19

2. Question
Replication of a virus inside a host cell results in the formation of how many daughter viruses?
- Thousands
- Two
- Four
- Hundreds
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Question 3 of 19

3. Question
What is the first step in the virus replication cycle?
- Binding to the host cell with attachment proteins on the viral surface
- Injection of the viral nucleic acid into the host cell
- Replication of the viral nucleic acid in the host cell
- Reprogramming of host cell metabolism to produce viral enzymes and structural proteins
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Question 4 of 19

4. Question
What must RNA viruses do before they replicate their nucleic acid?
- Make cDNA using reverse transcriptase
- Make mRNA using reverse transcriptase
- Make tRNA using reverse transcriptase
- Makes bDNA using reverse transcriptase
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Question 5 of 19

5. Question
If a single virus takes 2 hours to complete its replication cycle, and produces 5000 progeny which each infect another cell, how many viruses will there be after another 2 hours?
- 25000000
- 10000
- 250000
- 2500000
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Question 6 of 19

6. Question
Which of the following viral components need a host cell’s enzymes and metabolic pathways to be produced?
- All viral components (not including the lipid envelope of viruses)
- Capsid and nucleic acid
- Nucleic acid only
- Attachment proteins and nucleic acid
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Question 7 of 19

7. Question
Viruses need the following from a host cell
- Enzymes to copy nucleic acid, ribosomes
- Enzymes to copy nucleic acid, coat protein
- Coat protein, ribosomes
- Enzymes to copy nucleic acid, coat protein, ribosomes
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Question 8 of 19

8. Question
What is the name given to the protein coat that encapsulates the viral nucleic acid?
- Capsid
- Capsule
- Nucleus
- Nucleolus
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Question 9 of 19

9. Question
Where do viruses obtain their lipid envelope?
- From the host cell in which they replicate
- They synthesise it themselves
- They absorb lipids from the environment
- From adipocytes
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Question 10 of 19

10. Question
What happens to a virus in the absence of a host cell?
- Nothing, it cannot replicate without a host cell
- It divides by binary fission
- It synthesizes its own protein to stay alive
- It only expresses the genes it needs to survive
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Question 11 of 19

11. Question
What do viruses inject into host cells?
- Nucleic acid
- Capsid
- Attachment proteins
- Toxins
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Question 12 of 19

12. Question
What is the name of the host enzyme complex used to synthesise viral capsid?
- Ribosome
- DNA polymerase
- RNA polymerase
- ATPase
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Question 13 of 19

13. Question
What is the host enzyme used to synthesize viral RNA and mRNA?
- RNA polymerase
- DNA polymerase
- DNA helicase
- RNA hydrolase
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Question 14 of 19

14. Question
What is the name of the host enzyme complex used to synthesise viral attachment proteins?
- Ribosome
- DNA polymerase
- RNA polymerase
- ATPase
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Question 15 of 19

15. Question
Which of the following explains how viruses can spread rapidly through a population?
- A single virus infecting a cell can produce thousands of progeny viruses
- A single virus infecting a cell can produce only four progeny viruses
- A single virus infecting a cell can produce only two progeny viruses
- Because viruses aren't alive, they do not need to waste time
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Question 16 of 19

16. Question
Which of the following viral components does not need to be replicated using host cell ribosomes?
- Nucleic acid
- Reverse transcriptase
- Capsid
- Attachment proteins and nucleic acid
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Question 17 of 19

17. Question
If a single virus takes 2 hours to complete its replication cycle, and produces 1000 progeny which each infect another cell, long will it take to produce one million viruses?
- 2 hours
- 4 hours
- 100 hours
- 1000 hours
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Question 18 of 19

18. Question
During a 10 hour period, which of the following would produce the most progeny through replication
- Virus
- Bacteria
- Fungi
- Human
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Question 19 of 19

19. Question
Put the following in order of replication rate, from fastest to slowest: 1. Fungi 2. Bacteria 3. Virus 4. Human
- 3-2-1-4
- 3-1-2-4
- 4-1-2-3
- 1-3-2-4
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