Match List-I with List-II. List-I: A. Adenosine; B. Adenylic acid; C. Adenine; D. Alanine List-II: I. Nitrogen base; II. Nucleotide; III. Nucleoside; IV. Amino acid Choose the option with all correct matches.
Answer: (A) A-III, B-II, C-I, D-IV. Answer: (A) A-III, B-II, C-I, D-IV.
- A.A-III, B-II, C-I, D-IV✓
- B.A-II, B-III, C-I, D-IV
- C.A-III, B-IV, C-II, D-I
- D.A-III, B-II, C-IV, D-I
Correct Answer
(A) A-III, B-II, C-I, D-IV
Solution & Explanation
Answer: (A) A-III, B-II, C-I, D-IV. Solution: Adenosine is a base attached to a sugar, i.e., a nucleoside (A-III); adenylic acid additionally has a phosphate esterified, making it a nucleotide (B-II); adenine is a nitrogen base/purine (C-I); and alanine is an amino acid (D-IV). NCERT defines nucleosides as base+sugar and nucleotides as base+sugar+phosphate, naming adenosine and adenylic acid as the respective examples. NCERT Reference: Ch 9, p.106, line ~34 — "When found attached to a sugar, they are called nucleosides. If a phosphate group is also found esterified to the sugar they are called nucleotides. Adenosine... Adenylic acid... are nucleotides."