Bioinorganic Chemistry MCQs for CSIR NET & GATE (Assignment 2) - Download PDF

Bioinorganic Chemistry
MCQs for CSIR NET & GATE

Chapter wise Assignment-2

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Q1 The metal ions present in active site of nitrogenase enzyme cofactor are

[NET June 2013]

(a) Fe, Mo
(b) Fe, W
(c) Fe, Cu
(d) Fe, Ni

Q2 For the metalloprotein hemerythrin, the statement that is not true is

[NET June 2013]

(a) There are two ion centres per active site
(b) Both iron centres are hexacoordinated in the active state
(c) One iron is hexacoordinated while the other is pentacoordinated in the active state
(d) It is found in marine invertebrates.

Q3 The coordinated geometry of copper (II) in the type I copper protein plastocyanin is

[NET June 2013]

(a) square planer
(b) tetrahedral
(c) octahedral
(d) distorted tetrahedral

Q4 Molybdoenzymes can both oxidize as well as reduce the substrates, because

[NET June 2014]

(a) Mo (VI) is more stable than Mo (IV)
(b) Mo (IV) can transfer oxygen atom to the substrate and Mo (VI) can abstract oxygen atom from the substrate
(c) conversion of Mo (VI) to Mo (IV) is not favored
(d) Mo (VI) can transfer oxygen atom to the substrate and Mo (IV) can abstract oxygen atom from the substrate

Q5 The cooperative binding of O₂ in hemoglobin is due to

[NET June 2014]

(a) a decrease in size of iron followed by changes in the protein conformation
(b) an increase in size of iron followed by changes in the protein conformation
(c) a decrease in size of iron that is not accompanied by the protein conformational changes
(d) an increase in size of iron that is not accompanied by the protein conformational changes

Q6 if an enzyme fixes N₂ in plants by evolving H₂, the number of electrons and protons associated with that respectively are

[NET June 2014]

(a) 6 and 6
(b) 8 and 8
(c) 6 and 8
(d) 8 and 6

Q7 The extent of π-electron conjugation in macrocyclic rings of
1. Heme, 2. Coenzyme B12 and 3. Chlorophyll follows the order

[NET June 2014]

(a) 1 > 3 > 2
(b) 1 > 2 > 3
(c) 3 > 1 > 2
(d) 2 ~ 1> 3

Q8 Under physiological condition, oxygen is binding to deoxyhemoglobin and deoxy-myoglobin, the binding curve and its pH dependence, respectively are

[NET Dec 2014]

(a) sigmoidal and pH dependent; hyperbolic and pH independent
(b) hyperbolic and pH independent; sigmoidal and pH dependent
(c) sigmoidal and pH independent; hyperbolic and pH dependent
(d) hyperbolic and pH dependent; sigmoidal and pH independent

Q9 Match the metalloproteins in Column-A with their function in Column-B

[NET Dec 2014]

The correct answer is
(a) I-F, II-C, III-D, IV-A
(b) I-E, II-C, III-A, IV-F
(c) I-F, II-B, III-C, IV-A
(d) I-E, II-D, III-C, IV-A

Q10 The Fe-NPorphyrin bond distances in the deoxy and oxy-hemoglobin, respectively are

[NET June 2015]

(a) ~2.1 and 2.0 Å
(b) ~2.0 and 2.0 Å
(c) ~2.2 and 2.3 Å
(d) ~2.3 and 2.5 Å

Ans Key:

1.a 2.d 3.d 4.d 5.a 6.b 7.a 8.a 9.a 10.a

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