Question 1

Whether or not an enzyme is active and present within a cell depends on all of the following except

Accepted Answer

A)   if the gene for the enzyme has been turned on and the enzyme made.
B)   if the enzyme has been activated or inactivated by the addition of a phosphate group.
C)   whether an inhibitor is bound to the enzyme.
D)   whether the necessary cofactor is present.
E)   whether the enzyme catalyzes an endergonic or exergonic reaction.F) B) and D)
G) A) and B)

Question 2

The removal of electrons and/or hydrogen atoms from a substrate is called what?

Accepted Answer

A)   reduction
B)   oxidation
C)   phosphorylation
D)   metabolism
E)   an enzyme-substrate complexF) C) and E)
G) A) and D)

Question 3

The only source of energy for human beings is glucose because it can be broken down via cellular respiration.

Accepted Answer

A) True 
 B)False

Question 4

Which of the following molecules is NOT an enzyme?

Accepted Answer

A)   lipase
B)   maltase
C)   urease
D)   lactose
E)   ribonucleaseF) A) and C)
G) A) and E)

Question 5

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.F) C) and E)
G) B) and C)

Question 6

Which of the following is a byproduct of photosynthesis?

Accepted Answer

A)   carbon dioxide
B)   water
C)   oxygen
D)   glucose
E)   energyF) A) and D)
G) A) and B)

Question 7

If you wished to increase enzyme activity,you would do all of the following except

Accepted Answer

A)   increase the temperature moderately.
B)   increase the concentration of the enzyme.
C)   increase the amount of substrate.
D)   change to optimum pH for the reaction.
E)   decrease the temperature.F) A) and E)
G) A) and B)

Question 8

Because the inside of a cell is more organized than the outside,the inside of the cell has increased entropy.

Accepted Answer

A) True 
 B)False

Question 9

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 liquefied 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)   The reaction has probably 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 probably stopped because the yogurt has inactivated the enzyme.
E)   The reaction will continue until all of the substrate is used and the enzyme will still remain.F) C) and D)
G) None of the above

Question 10

Which is true about energy of activation?

Accepted Answer

A)   Energy of activation is measured as the energy that is released after a reaction occurs.
B)   Adding the correct enzyme can lower the energy of activation.
C)   In any one metabolic pathway, all steps will have the same energy of activation.
D)   Energy of activation is the difference between the energy of the reactant and the energy of the product.
E)   The energy of activation is always lower than the energy of the reactant.F) B) and E)
G) C) and D)

Question 11

When heat dissipates into the environment,it is no longer usable by the individual who produced it.

Accepted Answer

A) True 
 B)False

Question 12

Where within the cell is ATP built up?

Accepted Answer

A)   mitochondria
B)   cytoplasm
C)   nucleus
D)   endoplasmic reticulum
E)   Golgi bodyF) None of the above
G) A) and B)

Question 13

Free energy 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.F) None of the above
G) All of the above

Question 14

The addition of an enzyme will change the end result of a reaction.In other words,a particular reaction will result in a different product if an enzyme is used.

Accepted Answer

A) True 
 B)False

Question 15

The amount of energy available to do work after a chemical reaction has occurred is called

Accepted Answer

A)   entropy.
B)   metabolic energy.
C)   potential energy.
D)   kinetic energy.
E)   free energy.F) None of the above
G) A) and B)

Question 16

In feedback inhibition of a metabolic pathway,where does the inhibitor bind?

Accepted Answer

A)   to the substrate of the first reaction
B)   to the product of the first reaction
C)   to the enzyme of the first reaction
D)   to the enzyme of the last reaction
E)   to a substrate or the product of the last reactionF) D) and E)
G) A) and C)

Question 17

Which of the following statements most accurately describes the first law of thermodynamics?

Accepted Answer

A)   one usable form of energy cannot be completely converted into another usable form.
B)   one usable form of energy can be completely converted into another usable form.
C)   energy cannot be created or destroyed.
D)   energy can be neither created nor destroyed but it can be changed from one form to another.
E)   energy cannot be transformed.F) All of the above
G) A) and D)

Question 18

During cellular respiration,what is reduced?

Accepted Answer

A)   glucose
B)   oxygen
C)   carbon dioxide
D)   water
E)   ATP (energy) F) D) and E)
G) B) and C)

Question 19

Define the first law of thermodynamics.

Accepted Answer

The first law of thermodynamic...

Question 20

When a kinase adds phosphates to an enzyme,it will only activate the enzyme.

Accepted Answer

A) True 
 B)False

Exam 6: Metabolism: Energy and Enzymes

The only source of energy for human beings is glucose because it can be broken down via cellular respiration.

Correct Answer
verified

The removal of electrons and/or hydrogen atoms from a substrate is called what?

Correct Answer
verified

Free energy is calculated by

Correct Answer
verified

When a kinase adds phosphates to an enzyme,it will only activate the enzyme.

Correct Answer
verified

Which is true about energy of activation?

Correct Answer
verified

Define the first law of thermodynamics.

Correct Answer
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The first law of thermodynamic...
View Answer

Each enzyme has a particular substrate because enzymes

Correct Answer
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Because the inside of a cell is more organized than the outside,the inside of the cell has increased entropy.

Correct Answer
verified

The addition of an enzyme will change the end result of a reaction.In other words,a particular reaction will result in a different product if an enzyme is used.

Correct Answer
verified

The amount of energy available to do work after a chemical reaction has occurred is called

Correct Answer
verified

If you wished to increase enzyme activity,you would do all of the following except

Correct Answer
verified

Which of the following statements most accurately describes the first law of thermodynamics?

Correct Answer
verified

Which of the following molecules is NOT an enzyme?

Correct Answer
verified

During cellular respiration,what is reduced?

Correct Answer
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Which of the following is a byproduct of photosynthesis?

Correct Answer
verified

Where within the cell is ATP built up?

Correct Answer
verified

Whether or not an enzyme is active and present within a cell depends on all of the following except

Correct Answer
verified

When heat dissipates into the environment,it is no longer usable by the individual who produced it.

Correct Answer
verified

In feedback inhibition of a metabolic pathway,where does the inhibitor bind?

Correct Answer
verified

Correct Answer
verified

Exam 6: Metabolism: Energy and Enzymes

The only source of energy for human beings is glucose because it can be broken down via cellular respiration.

Correct AnswerverifiedShow Answer

The removal of electrons and/or hydrogen atoms from a substrate is called what?

Correct AnswerverifiedShow Answer

Free energy is calculated by

Correct AnswerverifiedShow Answer

When a kinase adds phosphates to an enzyme,it will only activate the enzyme.

Correct AnswerverifiedShow Answer

Which is true about energy of activation?

Correct AnswerverifiedShow Answer

Define the first law of thermodynamics.

Correct AnswerverifiedThe first law of thermodynamic...View AnswerShow Answer

Each enzyme has a particular substrate because enzymes

Correct AnswerverifiedShow Answer

Because the inside of a cell is more organized than the outside,the inside of the cell has increased entropy.

Correct AnswerverifiedShow Answer

The addition of an enzyme will change the end result of a reaction.In other words,a particular reaction will result in a different product if an enzyme is used.

Correct AnswerverifiedShow Answer

The amount of energy available to do work after a chemical reaction has occurred is called

Correct AnswerverifiedShow Answer

If you wished to increase enzyme activity,you would do all of the following except

Correct AnswerverifiedShow Answer

Which of the following statements most accurately describes the first law of thermodynamics?

Correct AnswerverifiedShow Answer

Which of the following molecules is NOT an enzyme?

Correct AnswerverifiedShow Answer

During cellular respiration,what is reduced?

Correct AnswerverifiedShow Answer

Which of the following is a byproduct of photosynthesis?

Correct AnswerverifiedShow Answer

Where within the cell is ATP built up?

Correct AnswerverifiedShow Answer

Whether or not an enzyme is active and present within a cell depends on all of the following except

Correct AnswerverifiedShow Answer

When heat dissipates into the environment,it is no longer usable by the individual who produced it.

Correct AnswerverifiedShow Answer

In feedback inhibition of a metabolic pathway,where does the inhibitor bind?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

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Correct Answer
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The first law of thermodynamic...
View Answer

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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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