Asymmetric Synthesis and Bio -Organic Chemistry MCQ Unit-III M.Sc. Chemistry Sem.III

 M. Sc.  Organic Chemistry Sem.III

CHEO – 315

Asymmetric Synthesis and Bio - Organic Chemistry

Third Semester

UNIT - III

Co - Enzyme Chemistry Introduction to co - enzymes, cofactors, prosthetic groups and apoenzymes  Enzymes and cofactors, Oxidoreduction (NAD, NADP), Pyridoxal phosphate (PLP), Thiamine pyrophosphate (TPP), Biotin (CO₂ carrier), Hemoglobin (0₂ carrier), Flavin (FMN, FAD, FADH₂), Oxine acid, Lip  Mechanisms of reactions catalyzed by co - factors.

Multiple Choice questions:

 1. Complex organic molecules or metalloorganic molecules called as
a) coenzyme
b) cofactor
c)  enzyme
d) none of above

2. Cytochrome oxidase enzyme contain cofactor
a)  Cu²⁺
b) Fe²⁺
c) Both a and b
d) Mg²⁺

3. Dinitrogenase enzyme contain cofactor
a)  Cu²⁺
b) Fe²⁺
c) Mo
d) Mg²⁺
 
4. Flavin adenine dinucleotide is the coenzyme which transfer
a)Carbon dioxide
b) Acyl group
c) Electrons
d) Aldehyde group

5. Thiamine pyrophosphate is the coenzyme which transfer
a)  carbon dioxide
b) acyl group
c)  electrons
d) aldehyde group

6. Biocytin is the coenzyme which transfer
a) carbon dioxide
b) acyl group
c)  electrons
d) aldehyde group

7. A coenzyme or cofactor that is very tightly or covalently bonded to enzyme protein called as
a) prosthetic group
b) heloenzyme
c)  heloproteins
d) none of the above

8. Conversion of NAD+ to NADH and vice versa produces
a) ATP
b) ADP
c)  AGP
d) ACP

9. Which of the following is reduced form of NAD?
a)  NADH₂
b) NADH
c)  NAD⁺
d) all of the above

10. NAD serves as a cofactor for
a)  dehydrogenase
b) reductases
c)  hydroxylase
d) all of the above

11. NAD and NADP are most abundant cofactor in
a) Eukaryotic cell
b) Prokaryotic cell
c)  both a and b
d) none of the above

12. Each molecule of NAD⁺ contains
a)  1 electron
b) 2electrons
c)  3 electrons
d) 4 electrons

13. Pyridoxine phosphate is used in synthesis of
a)  serotonin
b) taurine
c)  dopamine
d) all of the above

14. Recemization reaction of L-amino acid to D-amino acid
a) require pyridoxal phosphate
b) not require pyridoxal phosphate
c)  require any NAD
d) require NADPH

 15. Biotin is vitamin H which carries out the following reaction
a)  carboxylation
b) decarboxylation
c)  both a and b
d) amination

16.FADH₂ react with singlet oxygen to form
a) flavin hydroperoxide
b) Flavin
c)  FADO₂
d) none of the above

17. Bayer villager oxidation require
a) FAD
b) PLP
c)  ATP
d) all of the above

 18. Reaction in which squalene converted into oxisqualene require enzyme
a)  Flavin
b) Flavin hydroperoxide
c)  Both a and b 

 d) None of these

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