Question # 1

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

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Emil Fisher

Koshland

Freitz London

None

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

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protein

Carbohydrates

Lipids

Triglyceride

The molecule that fits the active sites that is called:

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Substrate

Enzyme

Catalyst

All

Trypsin works at the PH of:

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2

4

8

6

Denaturation of enzyme is caused by:

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Increased pH

Decreased pH

Increases in temperature above optimum temperature

Decreases in temperature

Which one of the following convert lipids to fatty acids?

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Protease

Lipase

Both

None

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

Almost all enzymes are:

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Carbohydrates

Fatty acids

Proteins

Vitamins

To what category of molecules do enzymes belong?

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Carbohydrates

Lipids

Nucleic acids

Proteins

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

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Temperature

pH

Carbon dioxide concentration

Enzyme concentration

Prosthetic groups are:

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Required by all enzymes

Loosely attached with enzymes

Proteins in nature

Tightly bound to enzyme

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

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Catalyzed

Dead

Cofactored

Denatured

Activation energy is required to:

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Activation enzyme

Start a reaction

Speed up a reaction

None

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