Enzymes - Mock Test 58

Question 571

In reversible non-competitive enzyme activity inhibition?

A) Vmax is increased B) Km is increased C) Km is decreased D) Concentration of active enzyme is reduced

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Question 572

A demonstrable inducer is absent in?

A) Allosteric enzyme B) Constitutive enzyme C) Inhibited enzyme D) Co-operative enzyme

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Question 573

An inducer is absent in the type of enzyme?

A) Allosteric enzyme B) Constitutive enzyme C) Co-operative enzyme D) Isoenzymic enzyme

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Question 574

If curve X in the graph (below) represents no inhibition for the reaction of the enzyme with its substrates, the curve representing the competitive inhibition, of the same reaction is?

A) A B) B C) C D) D

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Question 575

The kinetic effect of purely competitive inhibitor of an enzyme?

A) Increases Km without affecting Vmax B) Decreases Km without affecting Vmax C) Increases Vmax without affecting Km D) Decreases Vmax without affecting Km

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Question 576

The Km of the enzyme giving the kinetic data as below is?

A) –0.50 B) –0.25 C) 0.25 D) 0.33

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Question 577

A sigmoidal plot of substrate concentration ([S]) verses reaction velocity (V) may indicate?

A) Michaelis-Menten kinetics B) Co-operative binding C) Competitive inhibition D) Non-competitive inhibition

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Question 578

The enzyme which can add water to a carbon-carbon double bond or remove water to create a double bond without breaking the bond is?

A) Hydratase B) Hydroxylase C) Hydrolase D) Esterase

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Question 579

Activation or inactivation of certain key regulatory enzymes is accomplished by covalent modification of the amino acid?

A) Tyrosine B) Phenylalanine C) Lysine D) Serine

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Question 580

An example of lyases is?

A) Glutamine synthetase B) Fumarase C) Cholinesterase D) Amylase

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