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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base
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sugar
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phosphate group
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hydroxyl group
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Detailed explanation-1: -A nucleoside differs from a nucleotide in that it lacks the phosphate group.
Detailed explanation-2: –A nucleoside comprises the sugar bound to the nitrogenous base. A nucleotide, however, is a nucleoside bound to a phosphate group. Therefore, the correct answer is (A) Phosphate.
Detailed explanation-3: -The main difference lies in their molecular composition as Nucleosides contain only sugar and a base whereas Nucleotides contain sugar, base and a phosphate group as well. A nucleotide is what occurs before RNA and DNA, while the nucleoside occurs before the nucleotide itself.
Detailed explanation-4: -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.
Detailed explanation-5: -Nucleosides are glycosylamines that can be thought of as nucleotides without a phosphate group.