Enzyme: MCQs Quiz – 3 10

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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”

  • Reply ↓
    akanksha

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

    • Reply ↓
      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.

  • Reply ↓
    subhajit banerjee

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

    • Reply ↓
      Ramesh

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