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Biology 9th Class English Medium Chapter 6 Online Test MCQs With Answers

Question # 1

What is True about enzymes?

Choose an answer

They make biochemical reactions to proceed spontaneously

They lower the activation energy of a reaction

They are not very specific in their choice of substrates

They are needed in large quantities

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Question # 2

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

Choose an answer

Temperature

Carbon dioxide concentration

Enzyme concentration

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Question # 3

Prosthetic groups are:

Choose an answer

Required by all enzymes

Loosely attached with enzymes

Proteins in nature

Tightly bound to enzyme

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Question # 4

Which of the following characters is not true about enzymes?

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Globular in shape

Non-specific

Protein in nature

Highly reactive

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Question # 5

Vitamin which acts as co-enzyme is:

Choose an answer

Vitamin A

Vitamin K

Riboflavin

All of these

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Question # 6

The optimum temperature for human enzyme is between:

Choose an answer

10-20°C

20-35°C

35-40°C

5-10°C

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Question # 7

Enzymes accelerate reactions by_______the activation energy needed for the reaction.

Choose an answer

Stopping

Raising

Lowering

Binding

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Question # 8

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

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Question # 9

Coenzymes are small ................. molecules.

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Organic

Inorganic

Both

None

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Question # 10

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

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All actives sites have been occupied by substrate molecules

The enzyme molecule have denatured

More substrate acted as inhibitor

More substrate has disturbed has disturbed the pH of the medium

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Question # 11

Trypsin works at the PH of:

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Question # 12

Which enzyme breaks the peptide bods:

Choose an answer

Amylase

Protease

Lipase

None

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