CSIR-Gate Bio-inorganic chemisry question (2019-2020)
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This document contains questions and answers related to bio-inorganic chemistry from CSIR and GATE exams from 2019-2020. It was written by Dr. G. Balakrishnan, Assistant Professor in the Department of Chemistry at Vivekananda College in Madurai, Tamil Nadu. The document includes multiple choice questions about the coordination number and properties of copper ions in oxyhemocyanin, metalloenzymes and the reactions they catalyze, the functions of various metalloproteins, matching metalloenzymes with their metal cofactor and end product, and identifying correct statements about oxymyoglobin and cytochrome P450 in their resting states. Explanations and answers are provided for each question
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- 1. CSIR & GATE Bio-Inorganic Chemistry Questions (2019-2020) By Dr. G. Balakrishnan Assistant Professor Department of Chemistry Vivekananda College Madurai, Tamil Nadu 4/12/2020
- 2. Q 01: In oxyhemocyanin, the coordination number, mode of oxygen binding, color and the net magnetic behavior of copper ions, respectively are. (a) Four, µ-ƞ1:ƞ1-O2 -,Colorless and paramagnetic. (b) Five, µ-ƞ2:ƞ2-O2 -,Colorless and paramagnetic. (c) Five, µ-ƞ2:ƞ2-O2 -, blue and diamagnetic. (d) Four, µ-ƞ1:ƞ1-O2 -, blue and diamagnetic. Reason: 1. Oxyhemocyanin have Five coordination number So, option (a) and (d) wrong 2. Hapto symbol (ƞ) indicating the connectivity between the L and M. So, result is 2. 3. Cu2+ d9-it have unpaired electron so it colored (blue), also it’s strongly antiferromagnetic copuling resulting inGate 2020 4/12/2020
- 3. Q 02: The following table lists the reaction/conversion catalyzed by metalloenzymes Ans Gate 2020 4/12/2020
- 4. Q 03: Match the metalloproteins with their respective functions. Metalloproteins Functions P Ferritin I Electron transfer Q Rubredoxin (another name Iron –sulphur protein II Acid-base catalysis R Cobalamin III Metal storage S Carbonic anhydrase IV Methyl transfer Gate 2019 Answer: P-III; Q-I; R-IV; S-II 4/12/2020
- 5. Q 04: Match column I,II and III Metal (I) Enzyme (II) End product (III) A Ni i Carbonic anhydrase X Uric acid B Zn ii Xanthine oxidase Y Methane C Mo iii Coenzyme F430 Z Carbonic acid The correct match is (1) A-iii-Y; B-i-Z; C-ii-X (2) A-iii-Y; B-ii-X; C-i-Z (3) A-ii-X; B-i-Y; C-iii-Z (4) A-i-X; B-iii-Z; C-ii-Y CSIR-2019 DEC 4/12/2020
- 6. Q 05: Choose the correct statement for oxymyoglobin and cytochrome P450 (resting state) from the following: (a) both contain dianion of protoporphyrin-IX (b) they have some fifth-ligand bonded to metal centre from the protein backbone (c) they contain single active site (d) they contain metal ion in +3 oxidation state (1) a,b and c (2) a,c and d (3) a,b and d (4) b and c only CSIR-2019 DEC 4/12/2020
- 7. The 6 bonds realized by Fe(II) in oxymyoglobin with protoporphyrin-IX (Protoporphyrin IX molecule contains the porphine core, a tetrapyrrole macrocycle that shows marked aromatic character), histidine residue (His93) of globin, and molecular oxygen (O2). 4/12/2020