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Match the standard/stated cofactors in Column I with their respective enzymes in Column II

Column IColumn II
P. Cu2+(i) Dinitrogenase
Q. Se(ii) Cytochrome oxidase
R. Ni2+(iii) Pyruvate kinase
S. K+(iv) Glutathione peroxidase
T. Mo(v) Urease

  • A.P - (v); Q - (ii); R - (iv); S - (i); T - (iii)
  • B.P - (ii); Q - (iv); R - (v); S - (iii); T - (i)
  • C.P - (iv); Q - (ii); R - (iii); S - (i); T - (v)
  • D.P - (ii); Q - (i); R - (iii); S - (iv); T - (v)

Answer: B

The match is P-(ii); Q-(iv); R-(v); S-(iii); T-(i).

  • Copper (with haem iron) forms the redox centres of cytochrome oxidase (Complex IV).
  • Selenium, as selenocysteine, is in the active site of glutathione peroxidase.
  • Nickel is the metal of urease.
  • Potassium ions are required for the activity of pyruvate kinase.
  • Molybdenum is part of the iron-molybdenum cofactor of dinitrogenase.

The other options pair nickel or molybdenum with the wrong enzymes; for instance urease is the classic nickel enzyme, not a molybdenum one.

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