INTRODUCTION TO MICROSCOPY CELL BIOLOGY
DIFFERENTIATED CELL
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Adenine
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Cytosine
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Guanine
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Thymine
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Detailed explanation-1: -Definition. 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-2: -The adenine and uracil derivatives are paired by means of two hydrogen bonds, one from the amino group of adenine to 0ยท4 of uracil and the other from N-3 of uracil to the imidazole N-7 of adenine.
Detailed explanation-3: -Neither DNA nor RNA base pairs uracil with guanine. Guanine base pairs with a pyrimidine called cytosine. The conformation of guanine does not allow it to form hydrogen bonds with uracil. Uracil base pairs with the purine base adenine.