OBJECTIVE LIFE SCIENCE
MOLECULAR BIOLOGY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Which of these nitrogenous bases is NOT in DNA?
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Uracil
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Thymine
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Cytosine
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Guanine
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Explanation:
Detailed explanation-1: -Nitrogen base not found in DNA is uracil. It is found only in RNA.
Detailed explanation-2: -Uracil (U) is one of the four nucleotide bases in RNA, with the other three being adenine (A), cytosine (C) and guanine (G). In RNA, uracil pairs with adenine. In a DNA molecule, the nucleotide thymine (T) is used in place of uracil.
Detailed explanation-3: -The uracil is a nitrogen base of pyrimidine. The uracil present in RNA(ribonucleic acid) bonds with a double hydrogen bond with Adenine while absent in DNA(Deoxyribonucleic acid).
Detailed explanation-4: -Uracil is not found in DNA as it uracil has more base pair affinity to adenine, guanine and cytosine. Instead thymine is present in DNA.
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