Bioinorganic Chemistry - Inorganic Chemistry - Chemistry Previous Year Questions

1

2008 · Chemistry · Inorganic Chemistry · Bioinorganic Chemistry

Chemistry (CY) 2008

In biological systems, the metal ions involved in electron transport are

A

Na⁺ and K⁺

B

Zn²⁺ and Mg²⁺

C

Ca²⁺ and Mg²⁺

D

Cu²⁺ and Fe²⁺

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2

2009 · Chemistry · Inorganic Chemistry · Bioinorganic Chemistry

Chemistry (CY) 2009

In the transformation of oxyhaemoglobin to deoxyhaemoglobin

A

Fe\(^{2+}\) in the low spin state changes to Fe\(^{2+}\) in the high spin state

B

Fe\(^{2+}\) in the low spin state changes to Fe\(^{3+}\) in the low spin state

C

Fe\(^{2+}\) in the high spin state changes to Fe\(^{2+}\) in the low spin state

D

Fe\(^{2+}\) in the high spin state changes to Fe\(^{3+}\) in the high spin state

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3

2011 · Chemistry · Inorganic Chemistry · Bioinorganic Chemistry

Chemistry (CY) 2011

A well known naturally occurring organometallic compound is

A

vitamin B₁₂ coenzyme

B

chlorophyll

C

cytochrome P-450

D

myoglobin

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4

2011 · Chemistry · Inorganic Chemistry · Bioinorganic Chemistry

Chemistry (CY) 2011

The red color of oxyhaemoglobin is mainly due to the

A

d transition

B

metal to ligand charge transfer transition

C

ligand to metal charge transfer transition

D

intraligand π-π* transition

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5

2011 · Chemistry · Inorganic Chemistry · Bioinorganic Chemistry

Chemistry (CY) 2011

The question below consists of a pair of related words followed by four pairs of words. Select the pair that best expresses the relation in the original pair: Gladiator : Arena

A

dancer : stage

B

commuter : train

C

teacher : classroom

D

lawyer : courtroom

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6

2012 · Chemistry · Inorganic Chemistry · Bioinorganic Chemistry

Chemistry (CY) 2012

Hemoglobin is an oxygen carrying protein. The correct statement about oxy-hemoglobin is that

A

the metal is low-spin in +3 oxidation state while dioxygen is in O₂⁻ form

B

the metal is high-spin in +3 oxidation state while dioxygen is in O₂⁻ form

C

the metal is low-spin in +3 oxidation state while dioxygen is in neutral form

D

the metal is high-spin in +3 oxidation state while dioxygen is in neutral form

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7

2013 · Chemistry · Inorganic Chemistry · Bioinorganic Chemistry

Chemistry (CY) 2013

Oxymyoglobin Mb(O₂) and oxyhemoglobinHb(O₂)₄, respectively, are

A

paramagnetic and paramagnetic

B

diamagnetic and diamagnetic

C

paramagnetic anddiamagnetic

D

diamagnetic and paramagnetic

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8

2013 · Chemistry · Inorganic Chemistry · Bioinorganic Chemistry

Chemistry (CY) 2013

The number of oxygen molecule(s) that a molecule of hemerythrin can transport is ______.

A

B

C

D

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9

2014 · Chemistry · Inorganic Chemistry · Bioinorganic Chemistry

Chemistry (CY) 2014

Mg²⁺ is preferred in photosynthesis by chlorophyll 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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10

2016 · Chemistry · Inorganic Chemistry · Bioinorganic Chemistry

Chemistry (CY) 2016

During oxygen transport by hemerythrin, oxygen is bound as

A

O₂⁻ to one Fe(III) only

B

HO₂⁻ to one Fe(III) only

C

O₂²⁻ to one Fe(II) and one Fe(III)

D

O₂²⁻ to two Fe(II)

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11

2016 · Chemistry · Inorganic Chemistry · Bioinorganic Chemistry

Chemistry (CY) 2016

Amongst the following, the group that is bound to the metal ion in coenzyme B12 is

A

methyl

B

cyanide

C

adenosyl

D

hydroxyl

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12

2019 · Chemistry · Inorganic Chemistry · Bioinorganic Chemistry

Chemistry (CY) 2019

Match the metalloproteins with their respective functions.

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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13

2023 · Chemistry · Inorganic Chemistry · Bioinorganic Chemistry

Chemistry (CY) 2023

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

A

cysteine-S and methionine-S, respectively

B

methionine-S and cysteine-S, respectively

C

cysteine-S and cysteine-S, respectively

D

methionine-S and methionine-S, respectively

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14

2023 · Chemistry · Inorganic Chemistry · Bioinorganic Chemistry

Chemistry (CY) 2023

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

A

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

B

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

C

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

D

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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15

2024 · Chemistry · Inorganic Chemistry · Bioinorganic Chemistry

Chemistry (CY) 2024

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

A

Hemoglobin and Myoglobin

B

Hemocyanin and Carboxypeptidase

C

Hemerythrin and Carbonic anhydrase

D

Cytochrome P-450 and Hemocyanin

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16

2025 · Chemistry · Inorganic Chemistry · Bioinorganic Chemistry

Chemistry (CY) 2025

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

A

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

B

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.

C

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

D

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

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17

2007 · Chemistry · Inorganic Chemistry · Bioinorganic Chemistry

Chemistry (CY) 2007

In photosynthesis, the predominant metal present in the reaction centre of photosystem II is

A

Zn

B

Cu

C

Mn

D

Fe

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18

2007 · Chemistry · Inorganic Chemistry · Bioinorganic Chemistry

Chemistry (CY) 2007

Zn in carbonic anhydrase is coordinated by three histidine and one water molecule. The reaction of CO₂ with this enzyme is an example of

A

electrophilic addition

B

electron transfer

C

nucleophilic addition

D

electrophilic substitution

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19

2010 · Chemistry · Inorganic Chemistry · Bioinorganic Chemistry

Chemistry (CY) 2010

Among the following pair of metal ions present in Nature, the first one functions as an electron-transfer 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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20

2017 · Chemistry · Inorganic Chemistry · Bioinorganic Chemistry

Chemistry (CY) 2017

The V_O-O resonance Raman stretching frequency (in cm^-1) of the O₂ coordinated to iron centre in oxy-hemoglobin is nearly

A

1100

B

850

C

1550

D

1950

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