THE MOLECULAR BASIS OF INHERITANCE
DNA MAKES RNA MAKES PROTEIN
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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adenine
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uracil
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cytosine
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guanine
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Detailed explanation-1: -Uracil is present in RNA but not in DNA.
Detailed explanation-2: -A nucleotide consists of a sugar molecule (either ribose in RNA or deoxyribose in DNA) attached to a phosphate group and a nitrogen-containing base. The bases used in DNA are adenine (A), cytosine (C), guanine (G) and thymine (T). In RNA, the base uracil (U) takes the place of thymine.
Detailed explanation-3: -One of the four nucleobases in DNA’s nucleic acid, represented by the letters G-C-A-T, is thymine. This is so that the DNA repair enzymes may recognize thymine rather than uracil. Because thymine has a higher resistance to photochemical mutation and makes the genetic code more durable, DNA uses it instead of uracil.
Detailed explanation-4: -In RNA, the thymine is replaced by uracil (U).