A2.3 Viruses Quiz
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5 questions, one answer each
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1. Which feature is found in all viruses?
- A. Lipid envelope
- B. Protein capsid
- C. Ribosomes
- D. Double-stranded DNA
2. In the lysogenic cycle, lambda DNA:
- A. Is destroyed by the host
- B. Is integrated into the host chromosome
- C. Is released by lysis immediately
- D. Forms a new capsid
3. The final stage of the lytic cycle is:
- A. Attachment
- B. Injection
- C. Lysis of the host cell
- D. Integration
4. Why do features common to all viruses not prove a single origin?
- A. They could result from convergent evolution due to obligate parasitism
- B. Viruses have no genetic code
- C. All viruses are enveloped
- D. Viruses do not evolve
5. Why must the seasonal influenza vaccine be updated regularly?
- A. Influenza has a DNA genome
- B. Its surface antigens change rapidly by mutation and reassortment
- C. The vaccine becomes toxic
- D. Humans lose their immune system