Q1 · 2005-2021 · 2 marks
The metal present at the active site of the protein carboxypeptidase A is
- (a) Zinc
- (b) molybdenum
- (c) magnesium
- (d) cobalt
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Answer: (a)
GATE Chemistry (CY) — Bioinorganic Chemistry previous year questions
19 questions · 2005 · all with verified answer · last checked 2026-11-10
Q2 · 2005-2021 · 2 marks
Iron-sulphr clusters in biological systems are involved in
- (a) proton transfer
- (b) atom transfer
- (c) groups transfer
- (d) electron transfer
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Answer: (d)
Q3 · 2005-2021 · 2 marks
Amino acid side chain high affinity for \mathrm{Ca}^{2+} and \mathrm{Cu}^{2+} in metallo-proteins is:
- (a) carboxylate in both the cases.
- (b) imidazole in both the cases.
- (c) caboxylate for \mathrm{Ca}^{2+} and imidazole for \mathrm{Cu}^{2+}.
- (d) imidazole for \mathrm{Ca}^{2+}.
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Answer: (c)
Q4 · 2005-2021 · 2 marks
When a reduced cytochrome transfers an electron from its Fe (II) to the bound \mathrm{O}_{2},
- (a) The bond oder of \mathrm{O}_{2} is reduced by one and \mathrm{v}_{0_{2}} decreases.
- (b) A metal bound superoxide is formed and \mathrm{v}_{0_{2}} decreases.
- (c) A metal bound superoxide is formed and \mathrm{v}_{0_{2}} increases.
- (d) The bond order of \mathrm{O}_{2} is reduced by one and \mathrm{v}_{0_{2}} increases.
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Answer: (b)
Q5 · 2005-2021 · 2 marks
In biological system, the metal ion invovlved in the dioxgyen transport besides Fe is
- (a) Co
- (b) Zn
- (c) Mg
- (d) Cu
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Answer: (d)
Q6 · 2005-2021 · 2 marks
In biological systems, the metal ions involved in electron transport are
- (a) \mathrm{Na^+} and \mathrm{K^+}
- (b) \mathrm{Zn^{2+}} and \mathrm{Mg^{2+}}
- (c) \mathrm{Ca^{2+}} and \mathrm{Mg^{2+}}
- (d) \mathrm{Cu^{2+}} and \mathrm{Fe^{3+}}
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Answer: (d)
Q7 · 2005-2021 · 2 marks
Among the following pair of metal ions present in Nature, the first one functions as an electrontransfer agent and the second one catalyzes the hydrolysis reactions. The correct pair is
- (a) Fe and Zn
- (b) Mg and Fe
- (c) Co and Mo
- (d) Ca and Cu
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Answer: (a)
Q8 · 2005-2021 · 2 marks
A well known naturally occuring organometallic compound is:
- (a) vitamin \mathrm{B}_{12} coenzyme
- (b) chlorophyll
- (c) cytochrome p-450
- (d) myoglobin
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Answer: (a)
Q9 · 2005-2021 · 2 marks
\mathrm{Mg}^{2+} is preferred in photosynthesis by chlorphyll because
- (a) it has strong spin-orbit coupling
- (b) it has weak spin-orbit coupling
- (c) it is a heavy metal
- (d) it binds strongly with chlorophyll
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Answer: (b)
Q10 · 2005-2021 · 2 marks
Among the given pH values, the \mathrm{O_2} binding efficiency of hemoglobin is maximum at
- (a) 6.8
- (b) 7.0
- (c) 7.2
- (d) 7.4
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Answer: (d)
Q11 · 2005-2021 · 2 marks
Identify the function of hemocyanin and the metal responsible for it
- (a) \mathrm{O_2} transport and Fe
- (b) \mathrm{O_2} transport and Cu
- (c) electron transport and Fe
- (d) electron transport and Cu
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Answer: (b)
Q12 · 2005-2021 · 2 marks
During oxygen transport by hemerythrin, oxygen is bound as
- (a) \mathrm{O_2^-} to one Fe(III) only
- (b) \mathrm{HO_2^-} to one Fe(III) only
- (c) \mathrm{O_2^{2-}} to one Fe(II) and one Fe(III)
- (d) \mathrm{O_2^{2-}} to two Fe(II)
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Answer: (b)
Q13 · 2005-2021 · 2 marks
At pH 7.2 and 10 Torr oxygen partial pressure, the extent of \mathrm{O}_{2} binding is
- (a) high for both haemoglobin and myoglobin
- (b) high for haemoglobin and low for myoglobin
- (c) high for myoglobin and low for haemoglobin
- (d) low for both haemoglobin and myoglobin
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Answer: (c)
Q14 · 2005-2021 · 2 marks
Amongst the following, the group that is bound to the metal ion in coenzyme \mathrm{B_{12}} is
- (a) methyl
- (b) cyanide
- (c) adenosyl
- (d) hydroxyl
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Answer: (c)
Q15 · 2005-2021 · 2 marks
The \mathrm{v}_{\mathrm{O}-\mathrm{O}} resonance Raman stretching frequency (in \mathrm{cm}^{-1} ) of the \mathrm{O}_{2} coordinated to iron centre in oxyhemoglobin is nearly
- (a) 1100
- (b) 850
- (c) 1550
- (d) 1950
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Answer: (a)
Q16 · 2005-2021 · 2 marks
The \mathrm{O_2} coordinated to metal ion centres in oxy-myoglobin and oxy-hemocyanin exists, respectively, as
- (a) superoxide and peroxide
- (b) superoxide and superoxide
- (c) peroxide and peroxide
- (d) superoxide and oxygen
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Answer: (a)
Q17 · 2005-2021 · 2 marks
Match the metalloproteins with their respective functions.
| P | Frritin | I | Electron transfer |
| Q | Rubredoxin | II | Acid base catalysis |
| R | Cobalamin | III | Metal storage |
| S | Carbonic anhydrase | IV | Methyl transfer |
- (a) P - III; Q - II; R - I; S - IV
- (b) P - III; Q - I; R - IV; S - II
- (c) P - IV; Q - I; R - III; S - II
- (d) P - IV; Q - II; R - I; S - III
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Answer: (b)
Q18 · 2005-2021 · 2 marks
In oxyhemocyanin, the coordiantion number, mode of oxygen binding, color and the net magnetic behavior of copper ions, respectively are: (Given: atomic number of Cu is 29)
- (a) Four, \mu-\eta^{1}: \eta^{1}-\mathrm{O}_{2}{ }^{2-}, blue and diamagnetic.
- (b) Five, \mu-\eta^{2}: \eta^{2}-\mathrm{O}_{2}^{-}, colorless and paramagnetic.
- (c) Five, \mu-\eta^{2}: \eta^{2}-\mathrm{O}_{2}{ }^{2-}, blue and diamagnetic.
- (d) Four, \mu-\eta^{1}: \eta^{1}-\mathrm{O}_{2}^{-}, colorless and paramagnetic.
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Answer: (c)
Q19 · 2005-2021 · 2 marks
Which one of the following is a non-heme protein?
- (a) hemoglobin
- (b) myoglobin
- (c) hemocyanin
- (d) cytochrome P-450
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Answer: (c)
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