BIOLOGY
NUCLEIC ACIDS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Which nitrogen bases are considered purines and which are considered pyrimidines?
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A and T are pyrimidines, G, U, and C are purines
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A and G are purines, T, C, and U are pyrimidines
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A, U, and C are purines, T and G are pyrimidines
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A and G are pyrimidines, T, U, and C are purines
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Explanation:
Detailed explanation-1: -Purines (adenine and guanine) are two-carbon nitrogen ring bases while pyrimidines (cytosine and thymine) are one-carbon nitrogen ring bases.
Detailed explanation-2: -The purines in DNA are adenine and guanine, the same as in RNA. The pyrimidines in DNA are cytosine and thymine; in RNA, they are cytosine and uracil.
Detailed explanation-3: -Adenine (A) and guanine (G) are purines, and cytosine (C), thymine (T), and uracil (U) are pyrimidines.
Detailed explanation-4: -The purine bases are guanine (G) and adenine (A) which form corresponding nucleosides-deoxyribonucleosides (deoxyguanosine and deoxyadenosine) with deoxyribose moiety and ribonucleosides (guanosine, adenosine) with ribose moiety.
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