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Chapter 9: Problem 2

Which of the following does cytosine pair with? a. guanine b. thymine c. adenine d. a pyrimidine

Short Answer

Expert verified
a. guanine

Step by step solution

01

In the DNA molecule, there are two types of nucleobases: purines and pyrimidines. Purines consist of adenine (A) and guanine (G), while pyrimidines consist of cytosine (C) and thymine (T). According to base pairing rules for DNA, a purine always forms a pair with a pyrimidine. This means adenine (A) always pairs with thymine (T), and guanine (G) always pairs with cytosine (C). #Step 2: Identify the correct pairing for cytosine#

According to base pairing rules mentioned in Step 1, cytosine (C) pairs with guanine (G). So, the correct answer is: a. guanine

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