Question # 1

Succinic acid is the ____ of succinic dehydrogenase which undergoes____

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Active site, reduction

Prosthetic group, reduction

Substrate, oxidation

Substrate, reduction

The inhibitor having structural similarity with substrate is

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Irreversible inhibitor

Reversible inhibitor

Competitive inhibitor

Noncompetitive inhibitor

The rate of enzyme action will be minimum at

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Optimum pH

Optimum temperature

Optimum conditions

Maximum temperature

Which of the following is Koshland model

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Active site is rigid

Active site may be molded to précised shape

Position of active site is moveable

None

Ribozyme is found in

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Mitochondria

Cytoplasm

Lysosomes

Ribosomes

Many enzymes are simply dissolved in the

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Nucleoplasm

Stroma of chloroplast

Cytoplasm

Matrix of mitochondria

An activated enzyme consisting of polypeptide and cofactor is called as

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Activator

Apoenzyme

Holoenzyme

Coenzyme

Following enzymes are indicating the specificity of their action in their names, except

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Sucrase

Amylase

Pepsin

Lipase

Change in temperature from 30o C to 40o C in human body will cause ____ in rate of reaction

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Increase

Decrease

First increase then decrease

First increase then constant

By adding _______in neutral pH, we get the optimum pH of pancreatic lipase

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1

2

3

4

The term enzyme was coined from a Greek word which means

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In yeast

In grapes

In apple

In bacteria

Inorganic ions can play a role of ¬¬¬¬¬¬¬______ in enzyme catalysis

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Coenzyme

Inhibitor

Apo enzyme

Cofactor

If substrate concentration is unlimited, rate of enzyme action becomes

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Inversely proportional to enzyme concentration

Directly proportional to enzyme concentration

Directly proportional to substrate Concentration

Inversely proportional to substrate

Concentration

Which of the following is not affected by enzymes

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Nature and properties of end products

Nature and properties of reactants

Speed of biochemical reaction

Efficiency of biochemical reaction

Following substances can act as inhibitors, except

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Cyanide

Antimetabolites

Antibodies

Poisons

Nicotinamide adenine dinucleotide is an example of

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Cofactor

Coenzyme

Prosthetic group

Nucleotide

The enzyme that works best at intermediate pH is

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Pepsin

Chymotrypsin

Sucrase

Pancreatic lipase

Which one of the following enzymes have slightly acidic pH as optimum pH?

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Sucrase

Enterokinase

Pepsin

Catalase

Pick up the correct statement according to induced fit model of enzyme action

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Enzyme induces changes in substrate structure

Substrate induces changes in enzyme structure

Active site of enzyme is a rigid structure

Active site of enzyme is used as a template +

At high substrate level, all the active sites of enzyme are

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Destroyed

Available

Degenerated

Occupied

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