Enzymes Recap (5107)

Enzymes

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Enzymes are biological ​

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. They ​

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the rate of reactions.

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catalysts

speed up

dogalysts

slow down

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According to the lock and key hypothesis, ​

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are the lock and ​

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are the key.

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enzymes

substrates

products

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The part of the enzyme that substrates bind to is the

site.

The substrate binds to the enzyme's active site.

​

Multiple Choice

The shape of the active site is the same as the shape of the substrate.

• True

• False

The shape of the active site is complementary to the shape of the substrate. Only that substrate can fit in the active site.

The substrate does not have the same shape as the active site.

Multiple Choice

When a substrate binds to an enzyme, it's called an ____________.

• enzyme-substrate compound

• enzyme-substrate complex

• enzyme-substrate simplex

• enzyme-substrate relationship

Enzyme-substrate complex

Explain why enzymes are specific to one substrate.

Fill in the Blanks

Only a substrate with a shape that

in the enzyme's active site can bind to it.

Explain enzyme specificity

• Only a substrate with a shape that is complementary to the shape of the enzyme's active site

• Can bind to it to form an enzyme-substrate complex

• The enzyme cannot bind to any other substrate

Fill in the Blanks

After the enzyme catalyses the reaction,

are formed.

Multiple Choice

After the enzyme catalyses one reaction, it can be reused to catalyse another reaction.

• True

• False

Enzymes remain chemically unchanged after a reaction.

They can be used over and over again, and are thus required in small amounts.

Multiple Choice

At low temperatures, enzymes are _________.

• cold

• denatured

• inactive

• useless

As the temperature increases, rate of enzyme activity increases.

• This is because kinetic energy of enzyme and substrate molecules increase

• And they're more likely to have enough energy to bump into each other and form enzyme-substrate complexes.

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The temperature at which enzyme activity is the highest is known as the

temperature.

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When temperature rises too high above ​

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, enzymes are ​

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. The shape of their active site has ​

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. Theyy can no longer ​

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reactions.

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optimum

denatured

changed

catalyse

destroyed

Multiple Choice

Enzymes have an optimum pH.

• True

• False

Multiple Choice

Below optimum pH, enzymes are inactive. Above optimum pH, enzymes are denatured.

• True

• False

At optimum pH, enzyme activity is the highest.

As pH moves way from optimum, enzyme activity decreases.

If pH is too high or low, the enzyme is denatured.

Poll

How confident are you about enzymes?

• Very

• Kinda

• Not really

• Not at all