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NEET 2023, Chemistry Q19: Nucleic Acids

NEET2023Chemistry
Q.

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:

  1. A

    Both Statement I and Statement II are false

  2. B

    Statement I is true but Statement II is false

  3. C

    Statement I is false but Statement II is true

  4. D

    Both Statement I and Statement II are true

Solution

A nucleoside is correctly defined as the unit formed when a nitrogenous base attaches to the 1' position of the sugar (ribose or deoxyribose). Statement I is correct.

A nucleotide is formed when the nucleoside is esterified at the 5' position by phosphoric acid (), not phosphorous acid (). The two acids are chemically distinct. So Statement II is false.

Concept behind this question

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