Viral Evolution, Morphology, and Classification

Review Questions

Which statement is true?

  1. A virion contains DNA and RNA.
  2. Viruses are acellular.
  3. Viruses replicate outside of the cell.
  4. Most viruses are easily visualized with a light microscope.

Hint:

B

The viral ________ play(s) a role in attaching a virion to the host cell.

  1. core
  2. capsid
  3. envelope
  4. both b and c

Hint:

D

Viruses_______.

  1. all have a round shape
  2. cannot have a long shape
  3. do not maintain any shape
  4. vary in shape

Hint:

D

The observation that the bacteria genus Chlamydia contains species that can only survive as intracellular parasites supports which viral origin hypothesis?

  1. Progressive
  2. Regressive
  3. Self-replicating
  4. Virus-first

Hint:

B

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 on structure classification?

  1. Rabies virus
  2. Herpesviruses
  3. Retroviruses
  4. Influenza viruses

Hint:

A