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GATE 2025 BT – Question 18

General Biology · Biochemistry: Biomolecules, biological membranes, channels and pumps, molecular motors, action potential and transport · 1 mark · Multiple choice

Correctly match the following Monosaccharides with their respective Epimers.

MonosaccharideEpimer
P. D-mannose1. C-3 epimer of D-glucose
Q. D-allose2. C-4 epimer of D-glucose
R. D-galactose3. C-4 epimer of D-mannose
S. D-talose4. C-2 epimer of D-glucose
5. C-5 epimer of D-glucose
  1. P-4; Q-1; R-2; S-3
  2. P-5; Q-1; R-2; S-3
  3. P-4; Q-3; R-5; S-1
  4. P-1; Q-5; R-3; S-2

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Correct answer: (A) P-4; Q-1; R-2; S-3

Explanation

D-mannose differs from D-glucose at C-2, D-allose at C-3, and D-galactose at C-4. D-talose differs from D-mannose at C-4 (it is the C-4 epimer of D-mannose and the C-2 epimer of D-galactose).