Question 45 of 65
Q.Nucleoside is a nucleotide without ______.
(a) sugar
(b) nitrogen base
(c) hydrogen bond
(d) phosphate group
Maharashtra MsbshseMaharashtra HSC (MSBSHSE) Board 2018MCQ· 1mImportance★★★★★
69% · 45/65 Questions
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Start your 14-day free trial to unlock the full solution →(d) phosphate group — a nucleoside is a nitrogenous base joined to a pentose sugar; adding a phosphate group to a nucleoside makes it a nucleotide.
Nucleoside = base + sugar; nucleotide = base + sugar + phosphate.
A nucleic acid's monomer, the nucleotide, is built in two stages. First, an N-glycosidic bond joins a nitrogenous base (purine or pyrimidine) to a pentose sugar (ribose in RNA, deoxyribose in DNA) — this base-sugar unit alone is called a nucleoside (e.g. adenosine, guanosine, cytidine, thymidine). A nucleotide is formed only when a phosphate group …
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