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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phosphate group, sugar, thymine
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phosphate group, sugar, uracil
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Phosphate group, sugar, guanine
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phosphate group, ribose, guanine
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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: -Three of the five nitrogenous bases are common to both DNA and RNA. These are adenine (A), cytosine (C), and guanine (G).
Detailed explanation-3: -The sugar-phosphate backbone forms the structural framework of nucleic acids, including DNA and RNA. This backbone is composed of alternating sugar and phosphate groups, and defines directionality of the molecule.
Detailed explanation-4: -The nucleotides forming DNA and RNA are composed of a phosphate, sugar, and heterocyclic N-containing base unit, that is, the purine units adenine and guanine and the pyrimidine units uracil, cytosine, and thymine.
Detailed explanation-5: -Both DNA and RNA are made from nucleotides, each containing a five-carbon sugar backbone, a phosphate group, and a nitrogen base.