Question # 1

The enzyme function between a PH of ..................... .

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2 to 4

6 to 8

8 to 10

1 to 2

Lock and key model was proposed by:

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Emil Fischer

Melcher

Koshland

Saugeo

Enzymes are made up of ............. .

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protein

Carbohydrates

Lipids

Triglyceride

All enzymes are composed of:

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Lipids

Carbohydrates

Proteins

Phosphates

Enzymes accelerate reactions by_______the activation energy needed for the reaction.

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Stopping

Raising

Lowering

Binding

Almost all enzymes are:

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Carbohydrates

Fatty acids

Proteins

Vitamins

Catabolism constitutes ................. processes.

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Constructive

Destructive

Both a & b

None

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

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Chemical

Physical

Both

None

Which one of the following convert lipids to fatty acids?

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Protease

Lipase

Both

None

Activation energy is required to:

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Activation enzyme

Start a reaction

Speed up a reaction

None

Lock and key model was proposed by ................. .

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Emil Fisher

Koshland

Freitz London

None

Vitamin which acts as co-enzyme is:

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Vitamin A

Vitamin K

Riboflavin

All of these

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

To waht category of molecules do enzymes belong?

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Carbohydrates

Lipids

Nucleic acids

Proteins

Enzymatic reactions are _______ of times faster than uncatalyzed reactions:

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Millions

Hundreds

Thousands

Billion

What is true about cofactors?

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Break hydrogen bonds in proteins

Help facilitate enzyme activity

Increase activation energy

Are composed of proteins

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

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Catalyzed

Dead

Cofactored

Denatured

To what category of molecules do enzymes belong?

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Carbohydrates

Lipids

Nucleic acids

Proteins

What is True about enzymes?

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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

Trypsin works at the PH of:

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2

4

8

6

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

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