Question # 1

Changes in pH can alter the active site by affecting the

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Shape of substrate

Ionization of amino acids

Ionization of cofactor

Ionizaation of co enzyme

Set of biochemical reactions that occur in living organisms in order to maintain life is called.

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Catabolism

anabolism

Metabolism

Mutualism

Lock and key hypothesis of enzyme action supports that

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Active sites are rigid

Active sites are flexible

Active site efficiency increases

Active site can change its shape

The biochemical reactions in which larger molecules are synthesized are called.

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Catabolism

Metabolism

Anabolism

Digestive rections

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.

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.

Enzymes convert the substrate into different molecules called.

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Product

Reactants

Inhibitors

Biomolecules

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

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

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Metabolism

Catabolism

anabolism

Mutualism

Which is true about enzyme.

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All enzymes are not protein

All enzymes are proteins

All proteins are enzyme

All enzymes are vitamins

If you add more substrate to already occurrig enzymatic reaction and it has no effet on the rate of reaction. What is the form given to this situation.

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Denaturation

Saturation

Desaturation

Inhibition

Pepsin enzyme works in.

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Large intestine

Small intstine

Stomach

Heart

Enzyme pepsin in the stomach has an optimum pH of about

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3

2

4

5

How does competitive inhibitor affect enzyme action

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attaches with the substrate

Changes enzyme shape

Attaches and blocks the active site

Blocks the cofactors

Whcih does consume energy

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Catabolism

Metabolism

Anabolism

Both a and b

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

Which best defines an enzyme.

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A chemical that breaks down food

A hormone that regulates metabolism

A protein that speeds up reactions

A molecule that stores energy

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

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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