5.1

Question 1

Enzyme

Answer 1

proteins that help speed up metabolism, or the chemical reactions in our bodies

Question 2

Substrate

Answer 2

‘Supporting surface’ on which an organism grows.

Question 3

active site

Answer 3

a region on an enzyme that binds to a protein or other substance during a reaction.

Question 4

Activation energy

Answer 4

the energy needed to start a chemical reaction.

Question 5

Properties of Enzymes

Answer 5

• Enzymes are complex macromolecules with high molecular weight.
  -They catalyze biochemical reactions in a cell.
• Enzymes do not start a reaction.
• Enzymes affect the rate of biochemical reaction and not the direction.
• Enzymes are specific in action.
• Enzymatic activity decreases with increase in temperature.

Question 6

explain the relationships between reaction rate and Substrate concentration

Answer 6

Increasing substrate concentration also increases the rate of reaction to a certain point

Question 7

explain the relationships between reaction rate and Enzyme concentration

Answer 7

Increasing enzyme concentration will speed up the reaction, as long as there is substrate available to bind to

Question 8

explain the relationships between reaction rate and
Temperature

Answer 8

Increasing the temperature increases the average speed of the reactant molecules.

Question 9

explain the relationships between reaction rate and
ph

Answer 9

decreasing the pH would increase the rate of reaction