Answers NC-Biology CR 2024Catalysts

Catalysts Answers

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

substrate

reactant

product

enzyme

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What is a substrate?

a molecule that acts as a catalyst

a place on the enzyme where the reaction occurs

a place on the product where the enzyme fits

a reactant that is catalyzed by an enzyme

What must happen before a chemical reaction can begin?

The activation energy must be exceeded.

The activation energy must be reached.

The concentrations of products and reactants must be equal.

The concentration of reactant molecules must be reduced.

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

enzyme and substrate

reactant and substrate

substrate and product

reactant and product

Which is the best definition of activation energy?

the energy required to end a chemical reaction

the energy required to bind a substrate to an active site

the energy required to form or break the bonds of reactant molecules

the energy required to re-form bonds in product molecules

Which statement correctly describes a chemical reaction?

Reactants come out of a reaction.

Energy is always released.

Bonds between atoms break and reform.

Products go into a reaction.

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

catalyst

reactant

product

substrate

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

reactant

product

substrate

protein

The lock-and-key mechanism refers to

the complementary shapes of an enzyme and a substrate.

the attractive forces between an enzyme and a substrate.

the ability of an enzyme to lower the activation energy of a reaction.

the ability of an enzyme to “unlock” the products of a reaction.

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

More catalyst is present at the end than at the beginning of the reaction.

Less catalyst is present at the end than at the beginning of the reaction.

The amount of catalyst is the same at the end as at the beginning of the reaction.

The catalyst is consumed by the reaction, so none remains at the end of the reaction.

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