Enzyme: MCQs Quiz – 3 10


A online test of MCQs (Multiple Choice Questions) on “Enzyme“. Quiz No. 3

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Enzyme: MCQs Quiz - 3

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Question 1
The first enzyme to be purified and crystallized was
A
Urease
B
Diastase
C
Insulin
D
Zymase
Question 2
Beadle and Tatum showed that each kind of mutant bread mould they studied lacked a specific enzyme. Their experiments demonstrated that
A
Cells need specific enzymes in order to function
B
Genes are made of DNA
C
Genes carry information for making proteins
D
Enzymes are required to repair damaged DNA information
Question 3
Many enzymes are secreted in inactive form to protect
A
Cell Membrane
B
Mitochondria
C
Cell proteins
D
Cell DNA
Question 4
Most of the members of vitamin B complex act as
A
Cofactor
B
Coenzyme
C
Prosthetic group
D
Apoenzyme
Question 5
Restriction endonuclease is employed for
A
Cutting RNA
B
Cutting single stranded DNA
C
Cutting double stranded DNA
D
Joining strands of DNA
Question 6
Restriction endonucleases are enzymes which
A
Remove nucleotides from the ends of the DNA molecule
B
Make cuts at specific positions within the DNA molecule
C
Recognize a specific nucleotide sequence for binding of DNA ligase
D
Restrict the action of the enzyme DNA polymerase
Question 7
Ribozyme is
A
RNA without phosphate
B
RNA with sugar
C
RNA with enzyme activity
D
RNA with extra phosphate
Question 8
The activity of succinate dehydrogenase is inhibited by
A
Glycolate
B
Pyruvate
C
Malonate
D
Phosphoglycerate
Question 9
The enzyme responsible for the reduction of molecular nitrogen to the level of ammonia in the leguminous root nodule is
A
nitrogenase
B
nitrate reductase
C
nitrite reductase
D
all of the above
Question 10
The non protein part of an enzyme is known as
A
Holoenzyme
B
Vitamin
C
Apoenzyme
D
Prosthetic group
Question 11
The polypeptide or protein part of the enzyme is called
A
Apoenzyme
B
Holoenzyme
C
Prosthetic group
D
Zymogen
Question 12
Turn over number of an enzyme is dependent upon
A
Size of enzyme
B
Molecular weight of enzyme
C
Active sites
D
Concentration of substrate
Question 13
Which one of the following is resistant to enzyme action?
A
Leaf cuticle
B
Cork
C
Wood fibre
D
Pollen exine
Question 14
Which one of the following pairs is wrongly matched?
A
Textile - amylase
B
Detergents - lipase
C
Alcohol - nitrogenase
D
Fruit juice - pectinase
Question 15
Which one of the following statements is true with reference to enzymes?
A
Apoenzyme = Holoenzyme + Coenzyme
B
Holoenzyme = Apoenzyme + Coenzyme
C
Coenzyme = Apoenzyme + Holoenzyme
D
Holoenzyme = Coenzyme – Apoenzyme
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10 thoughts on “Enzyme: MCQs Quiz – 3

  • Akanksha

    In question 4, the organic group attached to the enzyme is called co enzyme which includes vitamins… not co factor. Co factor consists of all the non protien part of the enzyme namely co enzyme, prosthetix group, and metal activators.

  • Ramesh

    In question 4, you have given cofactors as the correct answer. The correct answer is coenzymes. Cofactors are inorganic while coenzymes are organic. B-Complex vitamins are organic and function as, or can be converted into, coenzymes e.g. Coenzyme A which contains pantothenic acid.

  • akanksha

    ques 8… is it not pyruvate?
    n i m not gettin d sense behind ques no. 2

    • Ramesh

      Malonate is the correct answer. The substrate of succinate dehydrogenase is succinate, a dicarboxylic acid. Malonate is also a dicarboxylic acid resembling succinate in structure. Hence it is a competitive inhibitor of succinate dehydrogenase.

  • subhajit banerjee

    Sir i have a great confusion with FAD & FMN,are they coenzymes or prosthetic groups?Plz reply sir.

    • Ramesh

      They are coenzymes. But generally, they are tightly bound to apoenzymes and can be be considered as prosthetic groups.