Discussion
A defective virus is one that
Answer: C
Correct answer: cannot complete replication without a helper virus
A defective virus lacks a function it needs - commonly through a deletion in its genome - and can replicate only in a cell co-infected by a helper that supplies it. Hepatitis D is the clinical example, being unable to make its own envelope and dependent on hepatitis B for it, which is why hepatitis D infection occurs only alongside hepatitis B.
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