Biology Quiz 2.4: Chemical Reactions and Enzymes

The elements and/or compounds used and transformed during a chemical reaction are called the​ (a)   .

The elements and/or compounds produced by the end of a chemical reaction are called the​ (b)   .

• reactants
• products
• factors
• solutions
• catalyst

Activation energy is best defined as...

How do catalysts affect the reaction rate of a substance?

• they decrease the amount of activation energy needed
• they have no impact on the reaction rate
• they cause the reaction to completely stop
• they cause the reaction energy to become inefficient

True or False:

Substances such as vitamins that positively affect the active site of enzymes are called coenzymes.

• True

• False

Using the diagram, match the following.

• Substrate

• B

• Active Site

• E

• Enzyme Substrate Complex

• A

• Enzyme

• D

• Product

• C

Once an enzyme has helped a reaction take place, it can then

• be reused for another reaction with the same kind of reactants.

• be broken down.

• be stored in the cell until it is needed again.

• be used to help different kinds of reactants go through a reaction.

Compare the two pathways, which pathway shows the reaction that has taken place with the help of an enzyme?

• Pathway 1

• Pathway 2

• You cannot tell from these graphs.

• Both reactions involved an enzyme.

FACT: Each enzyme only has one substrate that will fit its active site. 

Therefore an enzyme is said to be...

• reusable.

• useless.

• specific.

• fragile.

Which of the following can change and damage an enzyme's shape?

• A) a change in pH

• B) a large increase in temperature

• Both A and B

• Neither A nor B