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Nucleic acids: nucleotides, DNA and RNA
NEET level
Single correct option
Difficulty 1 of 3
bm202
A nucleoside consists of
A
a nitrogenous base, a pentose sugar and a phosphate group
B
a nitrogenous base and a pentose sugar
C
a pentose sugar and a phosphate group only
D
a nitrogenous base and a phosphate group only
Answer: B
A nucleoside is base + sugar joined by an N-glycosidic bond; adding a phosphate ester on the sugar gives a nucleotide.
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