Array Chapter 6 Biology 9th Class MCQ Test Preparation Sindh

Total Questions: 23

Total Marks: 23

Time: 25 Mins

Question # 1

If the concentration of enzyme is kept constant and amount of substrate is increased, a point is reached where increase in substrates concentration does not affect the reaction rate because of:

Enzymes get denatured at higher substrate concentration
Rate of reaction is indirectly proportional to substrate concentration at this point
All the active sites on enzyme molecule are occupied
None of these

Question # 2

Thiamine is a viteman which act as

Cofactor
Coenzyme
Inhibitor
Activator

Question # 3

Enzyme activity can be regulated by

Inhibitors and activators
Inhibitors and cofactors
Cofactors and coenzymes
Inhibitors and coenzymes

Question # 4

Non-protein components of enzymes are known as:

Activators
All of these
Coenzymes
Cofactors

Question # 5

Non protein molecules or ions known as

Coenzymes
Cofactores
Inhibitor
Activator

Question # 6

The terminology \'Enzyme\' was coined by:

Pasteur
Filder
Kuhne
Fischer

Question # 7

All biochemical catalist are not

Enzymes
Products
Proteins
All of above

Question # 8

Enzyme present in leaf, latex and roots of papaya and mountain papaya is:

Papanelin
Papus
All of these
Papain

Question # 9

The optimum temperature for maximum working speed of human enzyme is

Question # 10

The set of biochemical reactions that occur in living organisms known as

Catabolism
Metabolism
Anabolism
Substrates

Question # 11

Trypsin with high pH in alkaline medium works in

Small intestine
Large intestine
Rectum
Denum

Question # 12

To remove resistant starch residues in dish washing used

Protease enzyme
Amylase enzyme
Susbtrats
None

Question # 13

Lock and key model and induced fit model proposed by

Robert brown
John dalton
E-chatton
Deniel koshland

Question # 14

Amylase is an enzyme involved in the digestion of:

Potato
Almonds
Snack foods
All of these

Question # 15

Vitamins are essential to the survival of organisms, because vitamins usually function as:

None of these
Coenzyme
Prosthetic group
Cofactors

Question # 16

Regulators of enzymatic reactions are classified as:

Question # 17

All chemical reactions require

Substrates
Products
Activation energy
Enzymes

Question # 18

Catalytic region in which small portion of molecules are involved in catalysis of a biochemical reaction is called

active site
absorption site
duplication site
All of these

Question # 19

Flavin and heme is organic that lies under

Prosthetic group
Metabolic pathway
Cofactor
Activator

Question # 20

Coenzymes are small molecules. The nature of coenzyme is:

Complex molecule
None of these
Inorganic ion
Organic molecule

Question # 21

To produce alcohol enzyme are used in

Food industry
Brewing industry
Paper industry
Biological detergent

Question # 22

Which one of the following statement about enzyme is incorrect?

Some of them consist of protein with no non protein part.
All of these
They catalyze a chemical reaction without being utilized.
All enzymes are fibrous proteins.

Question # 23

Lock and key model explains

Enzyme substrate
Enzyme specificity
Formation of enzyme
None of these

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