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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DNA
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RNA
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Both
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Detailed explanation-1: -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: -Correct answer: RNA contains uracil, while DNA contains thymine. Explanation: RNA is different than DNA in that it 1) is single stranded (DNA is double stranded), 2) contains uracil (DNA contains thymine instead), and 3) contains a ribose sugar (DNA contains a deoxyribose sugar).
Detailed explanation-3: -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-4: -Explanation: RNA contains uracil, while DNA contains thymine.
Detailed explanation-5: -In addition to adenine, guanine, cytosine, and uracil, several unique bases, such as pseudouracil and dihydrouracil, are also found in tRNA. The structure and function of tRNA are discussed more fully in Chapter 17.