9th Class Biology Chapter 06 ENZYMES MCQs

by userFebruary 5, 2022April 17, 202200

BISE MCQs Biology Matriculation for Class 9th Chapter 06 ENZYMES

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

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Chapter No.06.

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Question 1

Prosthetic groups are:

A	Required by all enzymes
B	Loosely attached with enzymes
C	Tightly bound to enzyme
D	Proteins in nature

Question 2

Which of the following factors can affect enzyme activity?

A	Temperature
B	ALL
C	The.presence of certain metal ions
D	pi 1

Question 3

What happens to an enzyme when it denatures?

A	I he activation energy of the reaction is doubled
B	The shape of the enzyme molecule is changed
C	It's optimal conditions for temperature of the enzyme are doubled
D	The activation energy of the reaction is lowered

Question 4

What is TRUE about cofactors?

A	Break hydrogen bonds in proteins
B	Are composed of proteins
C	Help facilitate enzyme activity
D	Increase activation energy

Question 5

Almost all enzymes are composed of

A	Lipids
B	Carbohydrates
C	Phosphates
D	Proteins

Question 6

Which statement about enzyme catalyzed reactions is NOT true?

A	Enzymes form complexes with their substrates.
B	Enzymes lower the activation energy for chemical reactions
C	Enzymes can become substrate
D	Enzymes are regenerated at the end Of chemical reaction.

Question 7

To what category of molecules do enzymes belong?

A	Carbohydrates
B	Proteins
C	Lipids
D	Nucleic acids

Question 8

The building units of enzymes are:

A	Nucleic acid
B	Amino acids
C	Fatty.acids
D	Glycerol

Question 9

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

A	Dormant conditions
B	Optimal conditions
C	Efficient conditions
D	Comfortable conditions

Question 10

The first step in the cycle of an enzyme is:

A	Products released
B	Substrate binds to enzyme
C	Enzyme become free
D	Substrate converted

Question 11

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?

A	More substrate has disturbed the pH of the medium
B	The enzyme molecules have denatured
C	More substrate acted as. inhibitor
D	All active site have been occupied by substrate molecules

Question 12

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

A	The cytoplasm
B	The catalyst
C	The nucleus
D	The active site

Question 13

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

A	Substrate concentration
B	Temperature
C	pH
D	Carbon dioxide concentration

Question 14

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

A	None Specific
B	Protein in nature
C	Highly reactive
D	Globular in shape

Question 15

The initial rate of an enzyme catalysed reaction depends on

A	The affinity of the enzyme for its substrate
B	The concentration of the substrate
C	The concentration of the enzyme
D	All

Question 16

Enzymes work in:

A	Aqueous medium
B	Anaerobic condition
C	Solid medium
D	100°C

Question 17

What is TRUE about enzymes?

A	They make biochemical reactions to proceed spontaneously
B	They lower the activation energy of a reaction
C	They are not very specific in their choice of substrates
D	They are-needed in large quantities

Question 18

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

A	stopping
B	binding
C	lowering
D	raising

Question 19

The active site of an enzyme:

A	Can be used over and over again
B	Is similar to that of any other enzyme.
C	Is not affected by environmental factors like pH and Temperature
D	Is the part of the enzyme where its substrate can fit

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9th Class Biology Chapter 06 ENZYMES MCQs

Class 9th - Biology
Chapter No.06

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