THE MOLECULAR BASIS OF INHERITANCE
STRUCTURE OF NUCLEIC ACIDS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Which of the following nitrogenous bases are pyrimidines? Select all that apply!
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Thymine
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Uracil
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Adenine
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Cytosine
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Guanine
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Explanation:
Detailed explanation-1: -The pyrimidine bases are thymine (5-methyl-2, 4-dioxipyrimidine), cytosine (2-oxo-4-aminopyrimidine), and uracil (2, 4-dioxoypyrimidine) (Fig. 6.2).
Detailed explanation-2: -Pyrimidine: A nitrogenous base similar to benzene (a six-membered ring) and includes cytosine, thymine, and uracil as bases used for DNA or RNA.
Detailed explanation-3: -Purines (adenine and guanine) are two-carbon nitrogen ring bases while pyrimidines (cytosine and thymine) are one-carbon nitrogen ring bases.
Detailed explanation-4: -The pyrimidine bases are thymine, cytosine, and uracil. In GATCAATGC, four pyrimidine bases are present, two thymines and two cytosines. Thus, the correct answer is option A i.e., GATCAATGC.
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