GATE CY Bioinorganic Chemistry PYQs & Answers

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Questions 1–10 of 19. Imported answers require independent review unless marked reviewed.

Topic practice 19 questionsPage 1 of 2

The correct statement(s) regarding plastocyanin is(are)

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It is an electron transfer protein

It is intensely colored in its oxidised form

Its central metal ion has a distorted tetrahedral geometry

It contains S²⁻ bridged metal cluster

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The correct statement(s) about enterobactin (ent) is(are)

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It has three catechol moieties

It has a serine-trilactone backbone

It binds with Fe³⁺ ion to form [Fe(ent)]³⁻ ion

It has three hydroxamic acid groups

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Cytochrome P450 (CYP) enzymes catalyze stereoselective C–H hydroxylation of hydrocarbons in the presence of O₂. The correct statement(s) about the structure and activity of CYP is/are

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A thiolate group is coordinated to the Fe center at one of the axial positions around Fe.

While one of the oxygen atoms of O₂ is inserted into a C–H bond of a hydrocarbon, the other oxygen atom gets reduced to water.

An imidazole group is coordinated to the Fe center at one of the axial positions around Fe.

An iron-oxo species acts as a key oxidant in the catalytic cycle of CYP.

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Among the following metalloproteins, the pair(s) of non-heme proteins is (are)

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Hemoglobin and Myoglobin

Hemocyanin and Carboxypeptidase

Hemerythrin and Carbonic anhydrase

Cytochrome P-450 and Hemocyanin

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The tetracoordinated copper center in the oxidized and reduced forms of plastocyanin exhibits longest bond with

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cysteine-S and methionine-S, respectively

methionine-S and cysteine-S, respectively

cysteine-S and cysteine-S, respectively

methionine-S and methionine-S, respectively

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The correct statement(s) regarding myoglobin (Mb) and haemoglobin (Hb) is(are)

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At low partial pressure of O₂ (e.g., 5 kPa), the O₂ affinity of Hb lowers upon lowering the pH

Binding of the first O₂ molecule to Hb results in lower affinity for the binding of second O₂ molecule

Metal center in deoxy-Mb is low-spin whereas it is high-spin in the case of oxy-Mb

One end of O₂ binds to the metal center in oxy-Mb and the other end of the bound O₂ is H-bonded with imidazole-NH of a distal histidine

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The

resonance Raman stretching frequency (cm

) of the coordinated dioxygen in oxy-hemoglobin and oxy-hemocyanin appears, respectively, nearly at

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1136 and 744

1550 and 744

744 and 1136

744 and 1550

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Match the CORRECT option(s) from column A with column B according to the metal centre present in the active site of metalloenzyme.

A		B
P	Cu	I	B -coenzyme
Q	Mo	II	Carboxypeptidase
R	Co	III	Nitrate reductase
S	Zn	IV	Cytochrome P-450
		V	Tyrosinase

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P-V, Q-III, R-I, S-II

P-IV, Q-II, R-I, S-III

P-II, Q-IV, R-V, S-III

P-V, Q-III, R-II, S-IV

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The number of equivalents of H₂S gas released from the active site of rubredoxin, 2-iron ferredoxin, and 4-iron ferredoxin when treated with mineral acid, respectively, are

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4, 6, 8

0, 2, 4

1, 2, 4

0, 2, 3

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Which one of the following is a non-heme protein?

Your answerChoose one option.

hemoglobin

hemocyanin

myoglobin

cytochrome P-450

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GATE CY Bioinorganic Chemistry PYQs

How to practice Bioinorganic Chemistry

Question 24

Question 55

Question 50

Question 23

Question 23

Question 52

Question 18

Question 30

Question 43

Question 9