Natural Science (NATS) 1525 Practice Test

Which base pairs correctly pair in DNA?

C and G-T A-T and C-G A-U and C-G A-C and T-G

Correct Answer:

A-T and C-G

Explanation:

DNA base pairing follows specific rules: adenine pairs with thymine, and cytosine pairs with guanine. Adenine and thymine form two hydrogen bonds, while cytosine and guanine form three. This pairing preserves a uniform width of the DNA double helix and enables accurate replication. In RNA, uracil replaces thymine, so A-U occurs there, not in DNA. Therefore, the correct DNA pairings are adenine with thymine and cytosine with guanine.

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