CLEP Biology Practice Exam

Category - Biology

A researcher is studying a particular disease-causing agent. The agent has a protein coat, but it lacks a nucleus, contains no other organelles, and can reproduce only when it is inside an animal cell. The researcher should classify the agent as which of the following?
  1. a bacterium
  2. a fungus
  3. a protist
  4. a virus
Explanation
Answer: D - a virus
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