Match the biological entity given in List-I with the metal involved in it given in List-II
|
List-I Biological entity |
List-II Metal involved |
|
(A) Chlorophyll |
(I) Iron |
|
(B) Haemoglobin |
(II) Magnesium |
|
(C) Vitamin \( B_{12} \) |
(III) Nickel |
|
(D) Urease |
(IV) Cobalt |
Choose the correct answer from the options given below:
Answer & explanation
Correct answer: option 3
The correct answer is Option (3) → (A)-(II), (B)-(I), (C)-(IV), (D)-(III)
Many biological molecules are coordination compounds of a metal ion held by a large ligand; the metal is what lets the molecule do its job.
(A) Chlorophyll — This matches (II) Magnesium. Chlorophyll, the green pigment that absorbs light for photosynthesis, is a coordination compound of magnesium.
(B) Haemoglobin — This matches (I) Iron. Haemoglobin, the red pigment of blood that carries oxygen, is a coordination compound of iron.
(C) Vitamin B12 — This matches (IV) Cobalt. Vitamin B12 (cyanocobalamin), the anti-pernicious anaemia factor, is a coordination compound of cobalt.
(D) Urease — This matches (III) Nickel. Urease, the enzyme that hydrolyses urea, \( \ce{(NH2)2CO + H2O -> 2NH3 + CO2} \), has nickel ions at its active site.
Shortcut: (C)-(IV) appears only in Option (3).
Note: The question is from beyond the NCERT textbook.