SAT Subject Biology Practice Question 32: Answer and Explanation

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Question: 32

1. Which of these can be used to increase the amount of DNA available for analysis?

I. Cloning a plasmid

II. Gel electrophoresis

II. PCR

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

Correct Answer: C

Explanation:

The amount of DNA is amplified by engineering the DNA into a plasmid and cloning the plasmid in cell culture, as well as by performing PCR on the original DNA sample. Gel electrophoresis is a method for analyzing DNA, which often must be amplified first.

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