THE MOLECULAR BASIS OF INHERITANCE
DNA REPLICATION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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All of the following are true of purine bases, EXCEPT.
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contain two rings
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contain the element nitrogen
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capable of forming hydrogen bonds
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Cytosine is an example
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Explanation:
Detailed explanation-1: -The purines, adenine and cytosine, are large with two rings, while the pyrimidines, thymine and uracil, are small with one ring.
Detailed explanation-2: -Cytosine is a pyrimidine, and one of the nitrogenous bases found in ribonucleic acid (RNA) and deoxyribonucleic acid (DNA).
Detailed explanation-3: -Guanine is a purine base. Adenine is another purine base. Cytosine, Thymine and Uracil are pyrimidines.
Detailed explanation-4: -Examples of structures of purines: (1) adenine; (2) hypoxanthine; (3) guanine (G).
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