Question

Match the following:

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• A. A-II, B-I, C-III, D-IV
• B. A-III, B-I, C-II, D-IV
• C. A-III, B-I, C-IV, D-II
• D. A-II, B-I, C-IV, D-III

Hint:

When matching biological structures, always link based on function and composition: - Sugar + base = nucleoside (via glycosidic linkage), - Sugar + base + phosphate = nucleotide, - Backbone = sugar-phosphate chain.

Answer 1

The Correct Option is D

Understand each linkage and structure in the context of DNA.
A. 3'-5' phosphodiester linkage connects one nucleotide to another via phosphate groups. So, it matches with II: Nucleotide + Nucleotide.
B. N-Glycosidic Linkage connects the nitrogenous base to the sugar. Hence, it matches with I: Nitrogen base + Sugar.
C. 5' end of the polynucleotide refers to the end with a free phosphate group. So, it matches with IV: Free phosphate moiety.
D. Backbone of DNA is formed by repeated sugar-phosphate groups. So, it matches with III: Sugar + Phosphate. Step 2: Match accordingly. A → II
B → I
C → IV
D → III