Enzymes

Label the parts of the enzyme model

a

b

c

d

Active site

Substrate

Enzyme

Products

Enzymes are...

• nucleic acids
• proteins
• lipids
• carbohydrates

Click on the temperature that this enzyme is having optimum activity.

Which enzyme is most efficient in a basic solution?

• A
• B

What happens when enzymes are heated to a high temperature?

• The enzymes die.
• The shapes of the enzyme are altered denature
• The enzymes' amino acid sequence changes.
• The enzymes remain the same

An enzyme speeds up a reaction by

• lowering the activation energy.
• raising the activation energy.
• releasing energy.
• absorbing energy.

What happens to an enzyme when it is denatured?

• Activation energy is lowered.
• It becomes stronger.
• It loses its shape.
• Activation energy is raised.

What is the purpose of an enzyme?

• control how many reactions occur

• raise activation energy

• give permission for the reaction

• speed up chemical reactions

Enzymes act on many different substrates

• True

• False

Enzyme can be used again and again

• True

• False