Bioinorganic Chemistry
MCQs for CSIR NET & GATE
Chapter wise Assignment-2
Q1 The metal ions present in active site of nitrogenase enzyme cofactor are
(b) Fe, W
(c) Fe, Cu
(d) Fe, Ni
Q2 For the metalloprotein hemerythrin, the statement that is not true is
(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
(b) tetrahedral
(c) octahedral
(d) distorted tetrahedral
Q4 Molybdoenzymes can both oxidize as well as reduce the substrates, because
(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
(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
(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
(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
(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
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
(b) ~2.0 and 2.0 Ã…
(c) ~2.2 and 2.3 Ã…
(d) ~2.3 and 2.5 Ã…
Ans Key:
1.a 2.d 3.d 4.d 5.a 6.b 7.a 8.a 9.a 10.aAlso See
Chapterwise MCQsTopicwise MCQs