EMBRYOLOGY
CHROMOSOMES AND CELL DIVISIONS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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In DNA, adenine only pairs with
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adenine
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thymine
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uracil
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guanine
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Explanation:
Detailed explanation-1: -Under normal circumstances, the nitrogen-containing bases adenine (A) and thymine (T) pair together, and cytosine (C) and guanine (G) pair together. The binding of these base pairs forms the structure of DNA .
Detailed explanation-2: -This is normally 3 rings wide, purines like adenine and guanine are 2 ringed structures and pyrimidines line thymine and cytosine are one ringed structure. Hence, purines can’t bond within each other (as it will become a 4 ringed structure).
Detailed explanation-3: -The two strands are held together by hydrogen bonds between pairs of bases: adenine pairs with thymine, and cytosine pairs with guanine.
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