9th Class Biology Chapter No.6 ENZYMES MCQs

9th Class MCQs Biology Matriculation Chapter No.6 ENZYMES BISE

Book Name : Biology
Class / Grade : 9th
Level : (Secondary)
Chapter No. : 06
Chapter Name : ENZYMES
Book Publisher : Punjab Text Book Board Lahore 2022-24
MCQ from Text Book : 19
Exams conduct By: Board of Intermediate and Secondary Education Punjab
Note : All MCQ’s questions must be taken in Annual and Supplementary Papers from these MCQ’s.

Class 9th - Biology Chapter No.06

1 / 19

The active site of an enzyme:

Is the part of the enzyme where its substrate can fit

Is similar to that of any other enzyme.

Is not affected by environmental factors like pH and Temperature

Can be used over and over again

2 / 19

The initial rate of an enzyme catalysed reaction depends on

The concentration of the enzyme

The affinity of the enzyme for its substrate

All

The concentration of the substrate

3 / 19

The values for environmental factors. at which an enzyme functions best is called the:

Comfortable conditions

Dormant conditions

Efficient conditions

Optimal conditions

4 / 19

What is the area of an enzyme called where the chemical reactions occur ?

The cytoplasm

The active site

The nucleus

The catalyst

5 / 19

Enzymes accelerate reactions by_________________ the activation energy needed for the reaction....

raising

stopping

binding

lowering

6 / 19

The building units of enzymes are:

Fatty.acids

Nucleic acid

Glycerol

Amino acids

7 / 19

Which statement about enzyme catalyzed reactions is NOT true?

Enzymes can become substrate

Enzymes lower the activation energy for chemical reactions

Enzymes form complexes with their substrates.

Enzymes are regenerated at the end Of chemical reaction.

8 / 19

Which of the following- characters is not true about enzymes ?

Highly reactive

None Specific

Globular in shape

Protein in nature

9 / 19

Prosthetic groups are:

Required by all enzymes

Loosely attached with enzymes

Proteins in nature

Tightly bound to enzyme

10 / 19

Almost all enzymes are composed of

Lipids

Proteins

Carbohydrates

Phosphates

11 / 19

What is TRUE about cofactors?

Are composed of proteins

Break hydrogen bonds in proteins

Help facilitate enzyme activity

Increase activation energy

12 / 19

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?

The enzyme molecules have denatured

More substrate acted as. inhibitor

More substrate has disturbed the pH of the medium

All active site have been occupied by substrate molecules

13 / 19

To what category of molecules do enzymes belong?

Proteins

Nucleic acids

Carbohydrates

Lipids

14 / 19

Which of the following variable is LEAST likely to affect an enzymes rate of reaction?

Substrate concentration

Carbon dioxide concentration

Temperature

15 / 19

Enzymes work in:

Solid medium

Aqueous medium

100°C

Anaerobic condition

16 / 19

The first step in the cycle of an enzyme is:

Substrate binds to enzyme

Products released

Enzyme become free

Substrate converted

17 / 19

What is TRUE about enzymes?

They are not very specific in their choice of substrates

They are-needed in large quantities

They make biochemical reactions to proceed spontaneously

They lower the activation energy of a reaction

18 / 19

Which of the following factors can affect enzyme activity?

ALL

pi 1

Temperature

The.presence of certain metal ions

19 / 19

What happens to an enzyme when it denatures?

I he activation energy of the reaction is doubled

The shape of the enzyme molecule is changed

It's optimal conditions for temperature of the enzyme are doubled

The activation energy of the reaction is lowered

Your score is

The average score is 67%

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9th Class Biology Chapter No.6 ENZYMES MCQs

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