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NEET CHEMISTRYBiomoleculesMedium

Question

Given below are two statements: Statement I: A unit formed by the attachment of a base to 1' position of sugar is known as a nucleoside. Statement II: When nucleoside is linked to a 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:

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.

Step-by-Step Solution

Statement I is correct: A nucleoside is formed when a nitrogenous base is attached to the 1' position of a pentose sugar through an N-glycosidic linkage. Statement II is incorrect: A nucleotide is formed when a nucleoside is linked to a phosphoric acid (not phosphorous acid) at the 5' position of the sugar moiety through a phosphoester linkage.

Exam Context & Concepts Covered

This question aligns with the NEET CHEMISTRY syllabus, specifically targeting concepts from Biomolecules. Mastering this topic is crucial for scoring well in the upcoming medical entrance examinations. Solving conceptually related problems will help you understand the nuances of these concepts and improve your problem-solving speed.

CHEMISTRYBiomoleculesstatementsstatementformedattachmentposition

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