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Chapter 4: Problem 1

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

Short Answer

Expert verified
a. guanine (G) b. adenine (A) c. thymine (T) d. another pyrimidine Answer: a. guanine (G)

Step by step solution

01

Recall the DNA and RNA base pairing rules

In DNA, the bases pair according to Chargaff's rules, which state that adenine (A) pairs with thymine (T), and cytosine (C) pairs with guanine (G). In RNA, the bases pair according to the same rules but with a slight difference: adenine (A) pairs with uracil (U) instead of thymine (T).
02

Identify the correct base pairing for cytosine from the choices provided

By examining the options from the question, you can identify that the correct answer is: a. guanine (G)
03

Consider if cytosine would pair with a pyrimidine

Since cytosine is a pyrimidine, you can also evaluate whether it would pair with another pyrimidine. However, in both DNA and RNA, a purine (adenine and guanine) always pairs with a pyrimidine (cytosine, thymine, and uracil). Therefore, cytosine would not pair with another pyrimidine, making option d incorrect.

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