km (Michaelis constant) value of enzyme is the substrate concentration at which velocity of reaction is

1.Vmax

2.one fourth of Vmax

3.One third of Vmax

4.half of Vmax

Subtopic:  Properties of Enzymes |
 93%
From NCERT
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Select the option which is not correct with respect to enzyme action:

1.Substrate binds with enzyme at its active site

2.Addition of lot of succinate does not reverse the inhibition of succinic dehydrogenase by malonate

3.A non- competitive inhibitor binds the enzyme at a site distinct from that which binds the substrate

4.Malonate is a competitive inhibitor of succinic dehydrogenase

Subtopic:  Enzyme Inhibition |
 80%
From NCERT
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Which of the following class of enzyme is used for catalysing hydrolysis of ester, ether, peptide bonds?

1.Lyases

2.Ligases

3.Hydrolases

4.Both 1 and 2

Subtopic:  Enzymes Classification |
 87%
From NCERT
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Which of the following class of enzymes helps in catalysing a transfer of a group(other than hydrogen) between a pair of substrates?

1.Ligases

2.Lyases

3.Transferases

4.Hydrolases

Subtopic:  Enzymes Classification |
 90%
From NCERT
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Electron transferring enzymes belongs to which class of enzymes

1.Transferases

2.Oxidoreductases

3.Isomerases

4.Lyases

Subtopic:  Enzymes Classification |
 68%
From NCERT
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The non- protein constituent of the enzymes are called

1.Apoenzyme

2.Holoenzyme

3.Cofactors

4.both 1 and 3

Subtopic:  Enzyme Cofactors |
 73%
From NCERT
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Which of  the following are co-factors?

1.Co-enzymes

2.Metal ions

3.Posthetic groups

4.All of these

Subtopic:  Enzyme Cofactors |
 97%
From NCERT
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Which of the following is correct?

1.Apoenzyme = Holoenzyme + Coenzyme

2.Holoenzyme= Apoenzyme + Coenzyme

3.Coenzyme= Apoenzyme + Holoenzyme

4.Holoenzyme= Coenzyme + Cofactor

Subtopic:  Enzyme Cofactors |
 81%
From NCERT
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Which of the following is an inorganic compound?

1.Prosthetic group

2.Coenzymes

3.Metal ions

4.Apoenzymes

Subtopic:  Enzyme Cofactors |
 75%
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The Cofactor present in the Enzyme Catalase is

1.NADP

2.NAD

3.Haem

4.Zn

Subtopic:  Enzyme Cofactors |
 66%
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