AnswersFL-2000310-Biology 1 Sem 1 - FlexCatalysts

Catalysts Answers

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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.
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

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

A
catalyst
B
reactant
C
product
D
substrate
4

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?

A
The candy tablets being added to the drink.
B
The gasses being released when the drink was first opened.
C
The liquid in the container.
D
The container that holds the liquid.
5

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.
6

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.
7

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

A
enzyme and substrate
B
reactant and substrate
C
substrate and product
D
reactant and product
8

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

A
reactant
B
product
C
substrate
D
protein
9

Which statement correctly describes a chemical reaction?

A
Reactants come out of a reaction.
B
Energy is always released.
C
Bonds between atoms break and reform.
D
Products go into a reaction.
10

The lock-and-key mechanism refers to

A
the complementary shapes of an enzyme and a substrate.
B
the attractive forces between an enzyme and a substrate.
C
the ability of an enzyme to lower the activation energy of a reaction.
D
the ability of an enzyme to “unlock” the products of a reaction.

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