AnswersPA Human Anatomy Physiology A 2026-2027 SMITH ICCatalysts

Catalysts Answers

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M
More catalyst is present at the end than at the beginning of the reaction.
L
Less catalyst is present at the end than at the beginning of the reaction.
T
The amount of catalyst is the same at the end as at the beginning of the reaction.
T
The catalyst is consumed by the reaction, so none remains at the end of the reaction.
2
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How does a catalyst work?

b
by increasing the temperature of a chemical reaction
b
by decreasing the pressure of a chemical reaction
b
by increasing the concentration of reactants in a reaction
b
by decreasing the activation energy of a reaction
3

What is a substrate?

a
a molecule that acts as a catalyst
a
a place on the enzyme where the reaction occurs
a
a place on the product where the enzyme fits
a
a reactant that is catalyzed by an enzyme
4

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

T
The rate would increase.
T
The rate would decrease.
T
The rate would remain the same.
T
The rate would be zero.
5

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t
the energy required to end a chemical reaction
t
the energy required to bind a substrate to an active site
t
the energy required to form or break the bonds of reactant molecules
t
the energy required to re-form bonds in product molecules
6

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F
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.
F
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.
F
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.
F
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.
7

A student wants to create a liquid volcano. The student observes bubbles in the soft drink prior to opening it. The student first proceeds to open the soft drink bottle and place it on the floor.Next the student drops candy tablets into the drink at a continuous pace. The student notices a very powerful reaction in which the candies, still intact, are pushed out of the soda as the drink fizzes and starts to bubble.In this scenario, what would be the catalyst?

T
The candy tablets being added to the drink.
T
The gasses being released when the drink was first opened.
T
The liquid in the container.
T
The container that holds the liquid.
8

Which two substances bind using a lock-and-key mechanism?

e
enzyme and substrate
r
reactant and substrate
s
substrate and product
r
reactant and product
9

The lock-and-key mechanism refers to

t
the complementary shapes of an enzyme and a substrate.
t
the attractive forces between an enzyme and a substrate.
t
the ability of an enzyme to lower the activation energy of a reaction.
t
the ability of an enzyme to “unlock” the products of a reaction.
10

Lactase and carbonic anhydrase are examples of what type of substance?

s
substrate
r
reactant
p
product
e
enzyme

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Catalysts Answers — PA Human Anatomy Physiology…