Nucleosides are the structural subunit of nucleic acids such as DNA and RNA. A nucleoside, composed of a nucleobase, is either a pyrimidine (cytosine, thymine or uracil) or a purine (adenine or guanine), a five carbon sugar which is either ribose or deoxyribose. The base connected to sugar at position. Nucleotides are building blocks of nucleic acids DNA and RNA. Nucleotides are composed of a nitrogenous base, a five-carbon sugar (ribose or deoxyribose), and at least one phosphate group. Thus, a nucleoside plus a phosphate group yields a nucleotide.
Given below are two statements : Statement I: A unit formed by the attachment of a base to 1^' position of sugar is known as nucleoside Statement II:…
NEET UG 2023 — Chemistry Organic Chemistry
2023mcqmedium
Given below are two statements :
Statement I: A unit formed by the attachment of a base to 1′ position of sugar is known as nucleoside
Statement II: When nucleoside is linked to phosphorous acid at 5′-position of sugar moiety, we get nucleotide.
In the light of the above statements, choose the correct answer from the options given below:
Official previous-year question
Held on 30 Apr 2023 · Verified 9 Jul 2026.
Options
- A
Statement I is false but Statement II is true.
- B
Both Statement I and Statement II are true.
- C
Both Statement I and Statement II are false.
- D
Statement I is true but Statement II is false.
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