IAG_21.docx!!!!!!!!!!!!!!!! IAG_21.docx IAG_21.docx
OpenStax Biology 2e Instructor Answer Guide
Biology 2e
Unit 5: Biological Diversity
Chapter 21: Viruses
Visual Connection Questions
1. Which of the following statements about virus structure is true?
d. Glycoproteins help the virus attach to the host cell.
2. Influenza virus is packaged in a viral envelope that fuses with the plasma membrane. This
way, the virus can exit the host cell without killing it. What advantage does the virus gain by
keeping the host cell alive?
The host cell can continue to make new virus particles.
IAG_21.docx 4/20/2026, 2:15:29 PM IAG_21.docx
, IAG_21.docx!!!!!!!!!!!!!!!! IAG_21.docx IAG_21.docx
OpenStax Biology 2e Instructor Answer Guide
3. Which of the following statements is false?
c. An environmental stressor can cause the phage to initiate the lysogenic cycle.
Review Questions
4. Which statement is true?
b. Viruses are acellular.
5. The viral ________ plays a role in attaching a virion to the host cell.
d. both b and c (capsid and envelope)
6. Viruses_______.
d. vary in shape
7. The observation that the bacteria genus Chlamydia contains species that can only
survive as intracellular parasites supports which viral origin hypothesis?
b. Regressive
8. A scientist discovers a new virus with a linear, RNA genome surrounded by a helical
capsid. The virus is most likely a member of which family based off structure
classification?
a. Rabies virus
9. Which statement is not true of viral replication?
d. Newly released virions can infect adjacent cells.
IAG_21.docx 4/20/2026, 2:15:29 PM IAG_21.docx
OpenStax Biology 2e Instructor Answer Guide
Biology 2e
Unit 5: Biological Diversity
Chapter 21: Viruses
Visual Connection Questions
1. Which of the following statements about virus structure is true?
d. Glycoproteins help the virus attach to the host cell.
2. Influenza virus is packaged in a viral envelope that fuses with the plasma membrane. This
way, the virus can exit the host cell without killing it. What advantage does the virus gain by
keeping the host cell alive?
The host cell can continue to make new virus particles.
IAG_21.docx 4/20/2026, 2:15:29 PM IAG_21.docx
, IAG_21.docx!!!!!!!!!!!!!!!! IAG_21.docx IAG_21.docx
OpenStax Biology 2e Instructor Answer Guide
3. Which of the following statements is false?
c. An environmental stressor can cause the phage to initiate the lysogenic cycle.
Review Questions
4. Which statement is true?
b. Viruses are acellular.
5. The viral ________ plays a role in attaching a virion to the host cell.
d. both b and c (capsid and envelope)
6. Viruses_______.
d. vary in shape
7. The observation that the bacteria genus Chlamydia contains species that can only
survive as intracellular parasites supports which viral origin hypothesis?
b. Regressive
8. A scientist discovers a new virus with a linear, RNA genome surrounded by a helical
capsid. The virus is most likely a member of which family based off structure
classification?
a. Rabies virus
9. Which statement is not true of viral replication?
d. Newly released virions can infect adjacent cells.
IAG_21.docx 4/20/2026, 2:15:29 PM IAG_21.docx
