AnswersMO-Biology AProteins and Nucleic Acids

Catalysts Answers

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1
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Which component is released from the active site of an enzyme during a chemical reaction?

A
reactant
B
product
C
substrate
D
protein
2
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Lactase and carbonic anhydrase are examples of what type of substance?

A
substrate
B
reactant
C
product
D
enzyme
3

What must happen before a chemical reaction can begin?

A
The activation energy must be exceeded.
B
The activation energy must be reached.
C
The concentrations of products and reactants must be equal.
D
The concentration of reactant molecules must be reduced.
4

What is a substrate?

A
a molecule that acts as a catalyst
B
a place on the enzyme where the reaction occurs
C
a place on the product where the enzyme fits
D
a reactant that is catalyzed by an enzyme
5

Photosynthesis is an example of

A
an exothermic reaction.
B
an endothermic reaction.
C
a reaction that gives off heat.
D
a reaction that emits energy.
6

If the activation energy required for a chemical reaction were reduced, what would happen to the rate of the reaction?

A
The rate would increase.
B
The rate would decrease.
C
The rate would remain the same.
D
The rate would be zero.
7

A substance that influences the reaction but does not participate in the reaction is a

A
catalyst
B
reactant
C
product
D
substrate
8

Which statement best describes the amount of catalyst that remains at the end of a reaction?

A
More catalyst is present at the end than at the beginning of the reaction.
B
Less catalyst is present at the end than at the beginning of the reaction.
C
The amount of catalyst is the same at the end as at the beginning of the reaction.
D
The catalyst is consumed by the reaction, so none remains at the end of the reaction.
9

Which statement best describes how a catalyst can speed up a chemical reaction?

A
The catalyst decreases the activation energy needed.
B
The catalyst increases the concentration of products.
C
The catalyst binds to enzymes to release substrates.
D
The catalyst increases the concentration of reactants.
10

A researcher is designing a laboratory experiment to determine whether the inorganic substance A affects the rate of a reaction between two colored liquids, X and Y. When the reaction is complete, the liquid is clear. The reaction between X and Y is similar to one used by manufacturers to produce certain chemicals in factories.Which method would best answer his question about reaction rate and what will he find out about substance A?

A
First, he should measure the final temperature of the liquid when X and Y react without substance A. Then, he should measure the final temperature when he adds substance A to X and Y. He will find out if substance A is a catalyst.
B
First, he should measure how long it takes for the liquid to become clear if X and Y are mixed together. Then, he should measure how long it takes if he also adds substance A to X and Y. He will find out if substance A is a catalyst.
C
First, he should measure the final temperature of the liquid when X and Y react without substance A. Then, he should measure the final temperature when he adds substance A to X and Y. He will find out if substance A is an enzyme.
D
First, he should measure how long it takes for the liquid to become clear if X and Y are mixed together. Then, he should measure how long it takes if he also adds substance A to X and Y. He will find out if substance A is an enzyme.

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