LIFE SCIENCE

OBJECTIVE LIFE SCIENCE

BIOCHEMISTRY

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Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]

A nucleoside is composed of a ribose or deoxyribose sugar linked to a nitrogenous base. What else is required in order for the nucleoside to become a nucleotide?

A	One of 20 R groups.
B	Either a purine or a pyrimidine
C	A phosphate group
D	Glycerol

Explanation:

Detailed explanation-1: -A nucleoside consists of a nitrogenous base covalently attached to a sugar (ribose or deoxyribose) but without the phosphate group. When phosphate group of nucleotide is removed by hydrolysis, the structure remaining is nucleoside.

Detailed explanation-2: -In a nucleoside, nitrogenous base is attached to carbon-1’ of the pentose sugar.

Detailed explanation-3: -13-1). The nitrogen base plus the pentose (ribose or deoxyribose) is known as a nucleoside, with addition of phosphate forming a nucleotide.

Detailed explanation-4: -Deoxyguanosine is a purine nucleoside that has guanine attached to a deoxyribose sugar. Deoxyguanosine differs from guanosine by having deoxyribose as its sugar component instead of ribose. Deoxycytidine is a pyrimidine nucleoside that has cytosine attached to a deoxyribose ring.

There is 1 question to complete.