Multiple choice

Match the entries in Group I with the enzymes in Group II. Group I| Group II| | P. NAD+| 1. Glutathione peroxidase| | Q. Selenium| 2. Nitrogenase| | R. Pyridoxal phosphate| 3. Lactate dehydrogenase | | S. Molybdenum| 4. Glycogen phosphorylase|

  1. P - 3, Q - 2, R - 4, S - 1

  2. P - 4, Q - 1, R - 3, S - 2

  3. P - 3, Q - 1, R - 4, S - 2

  4. P - 3, Q - 4, R - 2, S - 1
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

NAD+ is the cofactor for lactate dehydrogenase (3) which catalyzes pyruvate ↔ lactate interconversion. Selenium is a key component of glutathione peroxidase (1) which protects against oxidative damage. Pyridoxal phosphate (vitamin B6) is the cofactor for glycogen phosphorylase (4) in glycogen breakdown. Molybdenum is the cofactor for nitrogenase (2) which fixes atmospheric nitrogen in bacteria. Therefore, P-3, Q-1, R-4, S-2 is correct (option C). Option A incorrectly pairs Q-2 and R-2 (conflict), option B incorrectly pairs P-4 and Q-1, and option D has incorrect pairing for Q (should be 1, not 4) and R (should be 4, not 2).

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