Enzyme: MCQs Quiz – 1 24

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A online test of MCQs (Multiple Choice Questions) on “Enzyme“. Quiz No. 1

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Enzyme: MCQs Quiz - 1

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Question 1
The general mechanism is that an enzyme acts by
A
reducing the energy of activation
B
increasing the energy of activation
C
decreasing the pH
D
increasing the pH
Question 2
The coenzyme is
A
often a metal
B
always a protein
C
often a vitamin
D
always an inorganic compound
Question 3
An enzyme that joins the ends of two strands of nucleic acid is
A
polymerase
B
ligase
C
synthetase
D
helicase
Question 4
Which of the following is produced with the combination of apoenzyme and coenzyme?
A
Holoenzyme
B
Enzyme substrate complex
C
Prosthetic group
D
Enzyme product complex
Question 5
An example of competitive inhibition of an enzyme is the inhibition of
A
succinic dehydrogenase by malonic acid
B
cytochrome oxidase by cyanide
C
hexokinase by glucose-6-phosphate
D
carbonic anhydrase by carbon dioxide
Question 6
Blocking of enzyme action by blocking its active sites is
A
allosteric inhibition
B
feedback inhibition
C
competitive inhibition
D
non-competitive inhibition
Question 7
Diastase takes part in digestion of ______.
A
Protein
B
Starch
C
Amino acids
D
Fat
Question 8
Enzyme catalyzing rearrangement of atomic groupings without altering molecular weight or number of atoms is
A
ligase
B
isomerase
C
oxidoreductase
D
hydrolase
Question 9
Enzyme complex involved in alcoholic fermentation is
A
Zymase
B
Invertase
C
Lipase
D
Amylase
Question 10
Zymogen or proenzyme is a
A
Modulator
B
Vitamin
C
Enzyme precursor
D
Hormone
Question 11
Enzymes are basically made up of
A
Fats
B
Proteins
C
Nucleic acids
D
Vitamins
Question 12
Catalysts are different from enzymes in
A
functional at high temperature
B
not used up in reaction
C
being proteinaceous
D
having high rate diffusion
Question 13
Enzymes are polymers of
A
Hexose sugar
B
Amino acids
C
Fatty acids
D
Inorganic phosphate
Question 14
The enzyme which hydrolyses starch to maltose is
A
protease
B
amylase
C
lactase
D
maltase
Question 15
Value needed for enzyme action is ______.
A
Low Km
B
Low Ki
C
High Km
D
High Ki
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There are 15 questions to complete.

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24 thoughts on “Enzyme: MCQs Quiz – 1”

  • Reply ↓
    satish

    sir i am little bit confuse about question no 5 option ……in ncert it is malonate and here it is melonic acid does this matter or not

    • Reply ↓
      Ramesh

      Malonate is the dissociated form of malonic acid. At physiological pH, malonic acid exists as malonate. These two terms are often used interchangeably.

    • Reply ↓
      Amit

      The Ki is the concentration of inhibitor at which under saturating substrate conditions the reaction rate is half of the maximum reaction rate Vmax.

  • Reply ↓
    Shivangi

    Well..!questions were good…i obtained good marks.. ..quite satisfactory…

  • Reply ↓
    ali

    question no 12 catalysts also not used up in a reaction then right option of the question is what

    • Reply ↓
      Administrator

      Catalysts are never used up in the course of a reaction. They speed up reactions by reducing activation energy.

      • Reply ↓
        Shahriar Alam

        No. 12 is wrong. Enzymes are ‘BIOLOGICAL CATALYSTS’.

      • Reply ↓
        preety

        Same is true for enzyme then wat is the diffrence. plz clear this confusion.

      • Reply ↓
        Amit

        i think option c is correct coz enzymes are proteneious in nature but inorganic catalyst are simple molecules like nickle, platinum