JAMB Biology 2023 Objective — Question 22
Question 22 of 40 from the Joint Admissions and Matriculation Board (JAMB) Biology 2023 Objective paper, with the correct answer and a full explanation.
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Adenine pairs with thymine because
- A. one is a purine with thymine because one is a purine base and the other, a pyrimidineCorrect
- B. they are both purines
- C. they are both pyrimidines
- D. the two occur in the same nucleic acid
Explanation
Two purines do not pair, nor do two pyrimidines; a purine pairs with the appropriate pyrimidine. Adenine (a purine) pairs with thymine (a pyrimidine); guanine pairs with cytosine. In RNA, thymine is replaced by uracil.
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