GENETICS AND EVOLUTION
MOLECULAR BASIS OF INHERITANCE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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antiparallel configuration
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complementary base pairing
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major and minor grooves
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uracil
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Detailed explanation-1: -uracil. The nitrogenous nucleotide thymine is absent from the DNA double helix, as is uracil.
Detailed explanation-2: -DNA double helix does not contain uracil because DNA molecules only have 4 nucleotides, A, G, C and T. Uracil belongs to RNA.
Detailed explanation-3: -Structure of an RNA double helix including uracil-uracil base pairs in an internal loop.
Detailed explanation-4: -Uracil is one of four nitrogen bases, most frequently found in normal RNA. Uracyl can be found also in DNA as a result of enzymatic or non-enzymatic deamination of cytosine as well as misincorporation of dUMP instead of dTMP during DNA replication.
Detailed explanation-5: -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.