Coenzymes

 

COENZYMES

Q. 1

Which vitamin is necessary for coenzyme A synthesis

 A Pantothenic acid
 B Ascorbic acid
 C Biotin
 D Pyridoxine

Q. 1

Which vitamin is necessary for coenzyme A synthesis

 A Pantothenic acid
 B Ascorbic acid
 C Biotin
 D Pyridoxine
Ans.A

Explanation:

A i.e. Pantothenic acid


Q. 2

Panthothenic acid is coenzyme of which of the following reaction (s):

 A Dehydrogenation
 B Oxidation
 C Decarboxylation
 D Acetylation

Q. 2

Panthothenic acid is coenzyme of which of the following reaction (s):

 A Dehydrogenation
 B Oxidation
 C Decarboxylation
 D Acetylation
Ans.D

Explanation:

D i.e. Acetylation

Pantothenic acid is necessary for synthesis of coenzyme A (CoA)Q, which functions as a coenzyme for acetylation reactionsQ


Q. 3

Coenzymes are…………..organic compounds :-

 A Lipoprotein
 B Proteinaceous
 C Non-protein
 D Any of the above

Q. 3

Coenzymes are…………..organic compounds :-

 A Lipoprotein
 B Proteinaceous
 C Non-protein
 D Any of the above
Ans.C

Explanation:

Q. 4

Coenzyme, in an enzymatic reaction usually functions to :

 A Activate the substrate
 B Increase the active sites of apoenzyme
 C Enhance the specificity of aponzyme
 D Accept one of the cleavage products

Q. 4

Coenzyme, in an enzymatic reaction usually functions to :

 A Activate the substrate
 B Increase the active sites of apoenzyme
 C Enhance the specificity of aponzyme
 D Accept one of the cleavage products
Ans.D

Explanation:

Q. 5

Coenzyme in carboxylation reactions:

 A Pyridoxine
 B Thiamine
 C Biotin
 D Cyanocobalamin

Q. 5

Coenzyme in carboxylation reactions:

 A Pyridoxine
 B Thiamine
 C Biotin
 D Cyanocobalamin
Ans.C

Explanation:

Biotin/ Vitamin H/ Coenzyme R

  • It is a water-soluble B-vitamin (vitamin B7).
  • It is composed of a ureido (tetrahydroimidizalone) ring fused with a tetrahydrothiophene ring.
  • A valeric acid substituent is attached to one of the carbon atoms of the tetrahydrothiophene ring.
  • Biotin is a coenzyme for carboxylase enzymes, involved in the synthesis of fatty acids, isoleucine, and valine, and in gluconeogenesis.

Q. 6

Coenzyme A is formed from which vitamin?

 A C
 B B4
 C Nicotinic acid
 D Pentothenic acid

Q. 6

Coenzyme A is formed from which vitamin?

 A C
 B B4
 C Nicotinic acid
 D Pentothenic acid
Ans.D

Explanation:

Q. 7

PLP is the coenzyme form of which vitamin?

 A B1
 B B3
 C B6
 D B12

Q. 7

PLP is the coenzyme form of which vitamin?

 A B1
 B B3
 C B6
 D B12
Ans.C

Explanation:

Q. 8

Coenzyme not required in formation of glutamate-

 A  Thiamine pyrophosphate
 B Pyridoxial phosphate
 C Niacin
 D None of the above

Q. 8

Coenzyme not required in formation of glutamate-

 A  Thiamine pyrophosphate
 B Pyridoxial phosphate
 C Niacin
 D None of the above
Ans.A

Explanation:

During transamination reaction glutamate is formed. Pyridoxial Phosphate acts as coenzyme.



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