Question # 1

Which of the followig are not changed during the biochemical reactions.

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Substrate

Enzymes

Products

ES complex

The active site of an enzyme

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Never changes

Forms no chemical bond with substrate

Determines by its structur ethe specificity of the enzyme

Looks like a lump projecting from the surface of an enzyme.

The biochemical reactions in which larger molecules are broken down are called

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Metabolism

Catabolism

anabolism

Mutualism

How does increasing temperatue affect enzyme activity.

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Increase actiity to a point

Always decreases activity

Makes enzymes non functional

No effect on enzyme

In the presence of enzymes, reactions proceed at a.

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Slower rate

Faster rate

Very slow rate

Medium rate

What is TRUE . according to the induced fit model of enzyme action.

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Enzyme's active site change shape to bind the substrate.

Substrate must fit the enzyme perfectly before binding

No shape changes occur durring binding

Enzyme is inactivated during the process.

What is true about the optimun pH values of the followign enzyes of digestive system.

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Both work at high pH

Both work at low pH

Pepsin works at low pH while trypsin works at high pH

Pepsin works at high pH while trypsin works at low pH

Primarily, all enzymes are.

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Proteins

Nucleic acids

Carbohydrates

Lipids

What can happen if an enzyme is exposed to temperature that is highr than its optimal temperature.

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Enzyme activity rate will increase

Enzyme's shape will change potentially reducing its activity

Enzyme will speed up the reaction and remain stable

Enzyme will become a substrate itself

Enzyme pepsin in the stomach has an optimum pH of about

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3

2

4

5

Increase or decrease in temperture beyond the optimum temperature will

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Increase the rate of reaction

Not affect the rate of reaction

Denature the enzyme

Decrease the rate of reactions

An enzyme works best at a pH of 7.4. It is places in an acidic solution with a pH of 4.0.How will this affect the enzyme.

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The substrate will become inactive in an acidic environment

the enzyme wil gain additional active sites

The enzyme will catalyse reactions faster due to increased H ions

The activ esite will be modified reducing substrate binding

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