SAT Subject Biology Practice Question 400: Answer and Explanation

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Question: 400

10. Which of the following organelles would be present in a eukaryote but NOT in a prokaryote?

I. Nucleus

II. Mitochondria

III. Ribosome

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

Correct Answer: C

Explanation:

C This is a I, II, III-style question, so eliminate choices as you eliminate options. Option I is true. Eukaryotes have nuclei and prokaryotes do not. You can eliminate choices B and D. Option II is also true. Eukaryotes have mitochondria, and prokaryotes do not. You can eliminate choice A. Option III is false. Prokaryotes do have ribosomes; they need to synthesize proteins just as eukaryotes do. Eliminate choice E. The thing to remember about prokaryotes is that they have no membrane-bound organelles. Ribosomes are not membrane-bound and ARE found in prokaryotes.

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