Discussion
Defective viruses are
Answer: A
Correct answer: Viruses that are genetically deficient and so incapable of producing infectious daughter virions
A defective virus is one missing part of its genome, so it can enter a cell but cannot complete replication on its own. It multiplies only in the presence of a helper virus that supplies what it lacks - hepatitis D, which needs hepatitis B, is the medical example.
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