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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glucose, water, and cellulose
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adenine, thymine, and cytosine
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a phosphate group, a sugar molecule, and a nitrogen
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a phosphate group, a five-carbon sugar, and an amino acid
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Detailed explanation-1: -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-2: -Each nucleotide, in turn, is made up of a nitrogenous base, a pentose sugar, and a phosphate.
Detailed explanation-3: -The DNA molecule is a polymer of nucleotides. Each nucleotide is composed of a nitrogenous base, a five-carbon sugar (deoxyribose), and a phosphate group. There are four nitrogenous bases in DNA, two purines (adenine and guanine) and two pyrimidines (cytosine and thymine).
Detailed explanation-4: -Hence the three components of a nucleotide are nitrogenous base, a pentose sugar, and phosphate.
Detailed explanation-5: -A nucleoside consists of a nitrogenous base covalently attached to a sugar (ribose or deoxyribose) but without the phosphate group. A nucleotide consists of a nitrogenous base, a sugar (ribose or deoxyribose) and one to three phosphate groups.