SAT Subject Biology Practice Question 432: Answer and Explanation

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Question: 432

2. A virus is considered a parasite because it

I. harms its host

II. kills its host

III. cannot reproduce outside its host

A. I only
B. II only
C. I and III only
D. II and III only
E. I, II, and III

Correct Answer: C

Explanation:

C Remember the I, II, III technique! Statement I is true; parasites (including viruses) harm their hosts (eliminate choices B and D). Not all parasites kill their hosts-you didn't die from the last viral cold you had, did you? Statement II is false (eliminate choice E). Last, statement III is true; a parasite requires a host for something, in the case of a virus it is to reproduce (eliminate choice A).

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