Question 1

Which of the following best describes what happens to chemical bonds during a chemical reaction?

Accepted Answer

Chemical bonds are broken in reactants and new bonds are formed to create products.

Question 2

In a reaction where glucose is broken down to release energy in a cell, which of the following terms best describes glucose?

Accepted Answer

Reactant

Question 3

Which of the following reactions is most likely to occur spontaneously?

Accepted Answer

A reaction that releases energy to its surroundings

Question 4

A scientist observes that a certain reaction only occurs when heat is applied. What does this indicate about the reaction?

Accepted Answer

It is an energy-absorbing reaction.

Question 5

Which of the following best explains how enzymes affect the activation energy of a chemical reaction?

Accepted Answer

Enzymes lower the activation energy, making the reaction occur faster.

Question 6

Consider the following scenario: In the human body, carbonic anhydrase catalyzes the reaction $$ \mathrm{CO_2$ + H_2O \rightarrow H_2CO_3} . $$What role does carbonic anhydrase play in this reaction?

Accepted Answer

It acts as an enzyme, lowering the activation energy.

Question 7

Which of the following statements about the enzyme-substrate complex is correct?

Accepted Answer

The substrate binds to the enzyme's active site, forming an enzyme-substrate complex.

Question 8

A patient has a genetic mutation that changes the shape of an enzyme's active site. What is the most likely consequence?

Accepted Answer

The enzyme will not bind its substrate effectively, reducing reaction rate.

Question 9

Which of the following equations best represents the general form of a chemical reaction?

Accepted Answer

$$ \mathrm{Reactants \rightarrow Products} $$

Question 10

If an enzyme is denatured by high temperature, what is the most likely effect on the chemical reaction it catalyzes?

Accepted Answer

The reaction rate will decrease because the enzyme's active site is altered.

Question 11

A reaction pathway diagram shows a lower peak for activation energy when an enzyme is present. What does this indicate?

Accepted Answer

The enzyme decreases the activation energy required for the reaction.

Question 12

Which of the following is true about the products of a chemical reaction?

Accepted Answer

They are the elements or compounds produced by the reaction.

Question 13

A reaction in a cell requires a constant input of energy to proceed. Which type of reaction is this?

Accepted Answer

Energy-absorbing reaction

Question 14

Which of the following best describes the function of enzymes in biological systems?

Accepted Answer

Enzymes lower the activation energy required for reactions.

Question 15

A student mixes two chemicals and observes that the container becomes warm. What type of reaction has likely occurred?

Accepted Answer

Energy-releasing reaction

Question 16

Which of the following is a correct statement about the specificity of enzymes?

Accepted Answer

Each enzyme is specific to a particular substrate due to the shape of its active site.

Question 17

In the reaction $$ \mathrm{CO_2$ + H_2O \rightarrow H_2CO_3} $$, what are the reactants?

Accepted Answer

$$ \mathrm{CO_2$} $$ and $$ \mathrm{H_2O} $$

Question 18

A metabolic pathway in a cell is slowed down when a certain enzyme is inhibited. What is the most likely explanation?

Accepted Answer

The enzyme is no longer lowering the activation energy for the reaction.

Question 19

Which of the following best explains why enzymes are not considered reactants in a chemical reaction?

Accepted Answer

Enzymes are unchanged and can be reused after the reaction.

Question 20

A patient is given a drug that binds to the active site of an enzyme, preventing the substrate from binding. What is this type of inhibition called?

Accepted Answer

Competitive inhibition

Chemical Reactions and Enzymes: Foundations for Anatomy & Physiology

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