Question 1

The function of an enzyme is to

Accepted Answer

A)   provide the energy for metabolic reactions.
B)   increase the rate of a metabolic reaction.
C)   change the direction of metabolic reactions.
D)   act as a buffer in metabolic reactions.
E)   raise the energy of activation for a reaction.

Question 2

While eating a container of yogurt, you have to leave, so you store the yogurt in the refrigerator. A day later you return and find the surface of the yogurt is no longer smooth but has broken into several liquified products. You correctly guess that enzymes from your saliva, via the spoon, have continued digesting the yogurt in your absence. What will happen over time?

Accepted Answer

A)   Nothing, the reaction has stopped because the amount of saliva is small and you would have to add more saliva to continue the degradation.
B)   The reaction will continue indefinitely since the enzyme is not consumed by the reaction.
C)   The reaction will continue until half is digested and then stop because the reaction between substrate and product will be balanced.
D)   The reaction has stopped because the yogurt has denatured the enzyme.
E)   As long as the enzyme is not denatured by environmental conditions, the reaction will continue until all of the substrate is used up.

Question 3

What is a metabolic reaction called that involves one reaction releasing energy to provide energy for a second reaction that requires energy?

Accepted Answer

A)   an endergonic reaction
B)   an exergonic reaction
C)   a coupled reaction
D)   a reversible reaction
E)   anabolism

Question 4

We often say that we need food for energy. In a biological sense, is this correct?

Accepted Answer

A)   Yes, because the smallest units inside the atoms that make up the food are simply pure energy.
B)   Yes, because the food must move through the digestive system, and motion is kinetic energy.
C)   Yes, because the food we eat has potential energy in its structure and this chemical energy can be converted into mechanical energy.
D)   No, because food consists of matter and cannot be transformed into energy.
E)   No, since all food matter stays matter, and energy remains energy.

Question 5

Gasoline engines use energy more efficiently than cells.

Accepted Answer

A) True 
 B)False

Question 6

All of the energy that a plant stores in the bonds of glucose are available to an animal to power its muscles.

Accepted Answer

A) True 
 B)False

Question 7

ATP contains

Accepted Answer

A)   an adenine base and one phosphate group.
B)   an adenine base and two phosphate groups.
C)   an adenine base and three phosphate groups.
D)   an adenine base, a ribose sugar, and two phosphate groups.
E)   an adenine base, a ribose sugar, and three phosphate groups.

Question 8

Explain the factors that will cause an enzyme to become denatured and what will occur structurally to the enzyme when it is denatured.

Accepted Answer

The two factors that will denature a pro...

Question 9

ATP can be broken down into

Accepted Answer

A)   ADP.
B)   ADP plus phosphate.
C)   ADP plus phosphate plus energy.
D)   pyruvate.
E)   lactate.

Question 10

Less energy is needed to bring about a reaction when an enzyme is present.

Accepted Answer

A) True 
 B)False

Question 11

Heat is a form of energy.

Accepted Answer

A) True 
 B)False

Question 12

Coenzymes and/or cofactors are necessary for optimal enzyme activity.

Accepted Answer

A) True 
 B)False

Question 13

Chloroplasts and mitochondria are both involved in redox reactions because

Accepted Answer

A)   carbon dioxide is reduced during photosynthesis and carbohydrates are oxidized during cellular respiration.
B)   both use carbon dioxide.
C)   photosynthesis uses energy and cellular respiration releases energy.
D)   both are required to be in all cells.
E)   energy cycles between the two organelles.

Question 14

Occasionally someone claims to have built a machine that can run forever, producing as much energy as it consumes. This has always been disproved because it violates

Accepted Answer

A)   the first law of thermodynamics.
B)   the second law of thermodynamics.
C)   entropy.
D)   laws preventing any conversion between types of energy.
E)   coupled reaction equations.

Question 15

Each enzyme has a particular substrate because enzymes

Accepted Answer

A)   increase the energy of activation.
B)   decrease the productivity of the cell.
C)   always require coenzymes.
D)   have active sites complementary in shape to their substrates.
E)   are named for their substrate.

Question 16

Will the reaction A + B turn into C spontaneously "move" forward if the free energy of A + B is 25 units and the free energy of C is 30 units?

Accepted Answer

A) True 
 B)False

Question 17

While science cannot describe "thinking" in physical terms, we are certain that the process involves metabolism inside brain cells. With positron emission tomography (PET scan) , it is possible to inject short-lived isotopes and image the regions of the brain that have the most active metabolism during various mental activities. However

Accepted Answer

A)   thought cannot be linked to cell processes because energy is not related to matter.
B)   since thoughts can occur over and over, the requirement for a continual input of energy to prevent entropy does not apply to this cell activity.
C)   the cellular energy expended in thinking must be less than the chemical bond energy supplied in food to these brain cells.
D)   "thinking" is beyond the scope of science to study.
E)   "thinking" is not a cellular process and therefore does not require energy.

Question 18

The change in free energy of a reaction, delta G, is calculated by

Accepted Answer

A)   subtracting the free energy content of the products from that of the reactants.
B)   subtracting the free energy content of the reactants from that of the products.
C)   adding the free energy content of the products to that of the reactants.
D)   the amount of free energy content of the reactants.
E)   the amount of free energy content of the products.

Question 19

When a cell uses substantial energy to organize its cell contents to a greater degree than the organization that exists outside the living cell

Accepted Answer

A)   energy has been created.
B)   entropy has increased.
C)   entropy has decreased.
D)   entropy remains the same.
E)   energy has been destroyed.

Question 20

Which of the following will increase enzyme activity?

Accepted Answer

A)   increase the temperature to boiling
B)   decrease the concentration of the enzyme
C)   alter the substrate
D)   change to optimum pH for the reaction
E)   decrease the temperature

Exam 6: Metabolism: Energy and Enzymes

Occasionally someone claims to have built a machine that can run forever, producing as much energy as it consumes. This has always been disproved because it violates

Correct Answer
verified

Correct Answer
verified

Explain the factors that will cause an enzyme to become denatured and what will occur structurally to the enzyme when it is denatured.

Correct Answer
verified
The two factors that will denature a pro...
View Answer

ATP can be broken down into

Correct Answer
verified

We often say that we need food for energy. In a biological sense, is this correct?

Correct Answer
verified

Will the reaction A + B turn into C spontaneously "move" forward if the free energy of A + B is 25 units and the free energy of C is 30 units?

Correct Answer
verified

All of the energy that a plant stores in the bonds of glucose are available to an animal to power its muscles.

Correct Answer
verified

Which of the following will increase enzyme activity?

Correct Answer
verified

Chloroplasts and mitochondria are both involved in redox reactions because

Correct Answer
verified

When a cell uses substantial energy to organize its cell contents to a greater degree than the organization that exists outside the living cell

Correct Answer
verified

Less energy is needed to bring about a reaction when an enzyme is present.

Correct Answer
verified

Coenzymes and/or cofactors are necessary for optimal enzyme activity.

Correct Answer
verified

Gasoline engines use energy more efficiently than cells.

Correct Answer
verified

Correct Answer
verified

The function of an enzyme is to

Correct Answer
verified

Heat is a form of energy.

Correct Answer
verified

ATP contains

Correct Answer
verified

The change in free energy of a reaction, delta G, is calculated by

Correct Answer
verified

Each enzyme has a particular substrate because enzymes

Correct Answer
verified

What is a metabolic reaction called that involves one reaction releasing energy to provide energy for a second reaction that requires energy?

Correct Answer
verified

Exam 6: Metabolism: Energy and Enzymes

Occasionally someone claims to have built a machine that can run forever, producing as much energy as it consumes. This has always been disproved because it violates

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Explain the factors that will cause an enzyme to become denatured and what will occur structurally to the enzyme when it is denatured.

Correct AnswerverifiedThe two factors that will denature a pro...View AnswerShow Answer

ATP can be broken down into

Correct AnswerverifiedShow Answer

We often say that we need food for energy. In a biological sense, is this correct?

Correct AnswerverifiedShow Answer

Will the reaction A + B turn into C spontaneously "move" forward if the free energy of A + B is 25 units and the free energy of C is 30 units?

Correct AnswerverifiedShow Answer

All of the energy that a plant stores in the bonds of glucose are available to an animal to power its muscles.

Correct AnswerverifiedShow Answer

Which of the following will increase enzyme activity?

Correct AnswerverifiedShow Answer

Chloroplasts and mitochondria are both involved in redox reactions because

Correct AnswerverifiedShow Answer

When a cell uses substantial energy to organize its cell contents to a greater degree than the organization that exists outside the living cell

Correct AnswerverifiedShow Answer

Less energy is needed to bring about a reaction when an enzyme is present.

Correct AnswerverifiedShow Answer

Coenzymes and/or cofactors are necessary for optimal enzyme activity.

Correct AnswerverifiedShow Answer

Gasoline engines use energy more efficiently than cells.

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

The function of an enzyme is to

Correct AnswerverifiedShow Answer

Heat is a form of energy.

Correct AnswerverifiedShow Answer

ATP contains

Correct AnswerverifiedShow Answer

The change in free energy of a reaction, delta G, is calculated by

Correct AnswerverifiedShow Answer

Each enzyme has a particular substrate because enzymes

Correct AnswerverifiedShow Answer

What is a metabolic reaction called that involves one reaction releasing energy to provide energy for a second reaction that requires energy?

Correct AnswerverifiedShow Answer

Correct Answer
verified

Correct Answer
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Correct Answer
verified
The two factors that will denature a pro...
View Answer

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verified

Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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