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AP Biology

Category - Biology

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Which of the following is a correct paring of nitrogenous bases in DNA?

Cytosine and uracil
Adenine and guanine
Thymine and cytocine
Cytosine and guanine
Guanine and uracil

Explanation

Answer: D, The correct pairing of nitrogenous bases in DNA is cytosine and guanine. In DNA, guanine pairs with cytosine and adenine pairs with thymine.

Key Takeaway: In DNA, one purine is paired with one pyrimidine. The purine adenine pairs with the pyridine thymine and the purine guanine pairs with the pyrimidine cytocine. Uracil is another pyrimidine, but it is only found in RNA, not DNA. In RNA, uracil replaces thymine and pairs with adenine.

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