Question # 1

When an enzyme is no longer able to work, it is said to be:

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Catalyzed

Dead

Cofactored

Denatured

Induced Fit model was proposed by:

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Emil Fischer

Melcher

Koshland

Saugeo

What is the effect of change in pH?

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Digradation of amino acids at active sites

Ionization of amino acids at active sites

Formation of new amino acids at active sites

All of these

Number of discovered enzymes are:

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200

2000

3000

3500

Non-protein part of enzymes are:

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Inhibitors

Substrate

Cofactors

Coenzymes

Enzymatic reactions are _______ of times faster than uncatalyzed reactions:

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Millions

Hundreds

Thousands

Billion

When we add more substrate to an already occurring enzymatic reaction and there is no increase in the rate of reaction, what would you predict?

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All active site have been occupied by substrate molecules

The enzyme molecule have denatured

More substrate acted as inhibitor

More substrate has disturbed the pH of the medium

Trypsin works at the PH of:

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2

4

8

6

Almost all enzymes are:

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Carbohydrates

Fatty acids

Proteins

Vitamins

Which enzyme works in stomach?

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Lipase

Trypsin

Pepsin

Amylase

Metabolism is of ............... types.

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1

2

3

4

All enzymes are composed of:

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Lipids

Carbohydrates

Proteins

Phosphates

metabolism is the some of the ................. proesses.

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Chemical

Physical

Both

None

The average temperature for human is ...............°C.

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35°C

36°C

37°C

38°C

Minimum energy required to start a chemical reaction is called:

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Potential energy

Chemical energy

Activation energy

All are same

Which enzyme breaks the peptide bods:

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Amylase

Protease

Lipase

None

The substance on which an enzyme act is called:

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Cofactor

Inhabitor

Coenzyme

Substrate

The first step in the cycle of an enzyme is;

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Substrate binds to enzyme

Substrate converted

Products released

Enzyme become free

Lock and key model was proposed by:

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Emil Fischer

Melcher

Koshland

Saugeo

Vitamin which acts as co-enzyme is:

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Vitamin A

Vitamin K

Riboflavin

All of these

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9th Class Biology Chapter 6 Enzymes English Medium KPK Boards Online Mcqs MCQs With Answers

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