Question 1

Astrophysicists explain that eventually the sun will swell to become a red giant,engulf the earth and "burn out" with all forms of energy dispersing in a final "heat death." Compared with conditions today,the entropy of the universe then will

Accepted Answer

A)  have increased greatly.
B)  have decreased greatly.
C)  remain the same because energy cannot be created or destroyed.D) All of the above
E) A) and C)

Question 2

Coupling occurs when the energy released by an exergonic reaction is:

Accepted Answer

A)  used to drive another exergonic reaction.
B)  used to drive an endergonic reaction.
C)  lost as nonusable heat to the environment.
D)  used to decrease the entropy of the universe.
E)  All of the choices are correct.F) C) and D)
G) B) and E)

Question 3

Which of the following labels is incorrectly identified.

Accepted Answer

A)  A refers to the products.
B)  B refers to the substrate-enzyme complex.
C)  C refers to the reactants.
D)  D refers to the product.E) A) and D)
F) All of the above

Question 4

Study the graph at right.The letter 'B ' depicts the _____,while 'C' depicts ________.

Accepted Answer

A)  Energy of Activation; Energy of products
B)  Energy of products; Energy of Activation
C)  Energy of reactants; Energy of products
D)  Reactant concentration; Activation EnergyE) A) and D)
F) B) and D)

Question 5

Which of these statements is NOT a consequence of the second law of thermodynamics?

Accepted Answer

A)  While the total amount of energy is unchanged,the energy lost as heat is no longer useful to the cell in doing work.
B)  Reactions that occur spontaneously are those that increase the amount of useful energy in a system.
C)  The amount of disorder in the universe is always increasing.
D)  To maintain organization of a cell,a continual input of energy is required.E) A) and B)
F) B) and C)

Question 6

An enzyme is a globular protein that inhibits the formation of chemical bonds within the enzyme's substrate(s)causing the rate of the reaction to slow down.

Accepted Answer

A) True 
 B)False

Question 7

Which statement describes the currently accepted theory of how an enzyme and its substrate fit together?

Accepted Answer

A)  As the product is released,the enzyme breaks down.
B)  The enzyme is like a key that fits into the substrate,which is like a lock.
C)  The active site is permanently changed by its interaction with the substrate.
D)  As the substrate binds to the enzyme,the shape of the active site changes to accommodate the reaction.E) C) and D)
F) All of the above

Question 8

During the conversion of glucose into a free form of energy only a small percentage is converted into useable ATP.What is the rest of the energy converted into?

Accepted Answer

A)  heat
B)  CO2
C)  H2O
D)  CO-E) C) and D)
F) B) and D)

Question 9

Endergonic reactions:

Accepted Answer

A)  release energy.
B)  have a negative  Δ\DeltaΔ G and occur spontaneously.
C)  can only occur if there is an input of energy.
D)  have products with less free energy than the reactants.
E)  All of the choices are correct. F) None of the above
G) C) and D)

Question 10

In this pathway,B  →\rightarrow→  C is coupled with ADP  →\rightarrow→  ATP.Categorize the reactions as endergonic or exergonic.

Accepted Answer

A)  B  →\rightarrow→  C is endergonic and ADP →\rightarrow→  ATP is exergonic.
B)  ADP  →\rightarrow→  ATP is endergonic and B →\rightarrow→  C is exergonic.
C)  Both B  →\rightarrow→  C and ADP →\rightarrow→  ATP are endergonic.
D)  Both B  →\rightarrow→  C and ADP →\rightarrow→  ATP are exergonic. E) A) and B)
F) None of the above

Question 11

Which of the following is consistent with the laws of physics governing energy?

Accepted Answer

A)  When a liter of gasoline is burned in a car engine,100% of its energy goes into moving the car along the road.
B)  You eat a "quarter-pounder" hamburger and assemble exactly a quarter-pound of additional body weight on your body.
C)  Eventually sunlight that is absorbed on the earth returns to space as dispersed heat.
D)  A calorie of sunlight becomes a calorie of plant tissue that,eaten by you,becomes a calorie of heat lost in muscle "power."
E)  Chemical bonds are a case of converting energy to matter; breaking the bonds converts matter to energy.F) C) and D)
G) D) and E)

Question 12

An automobile engine is about 20 - 30% efficient in converting chemical energy to mechanical energy.Cells are about 39% efficient in the transformation of glucose to ATP.The rest of the energy is lost as heat.This is illustrative of the:

Accepted Answer

A)  First Law of Thermodynamics.
B)  Second Law of Thermodynamics.
C)  Third Law of Thermodynamics.
D)  The Cell Theory.E) A) and B)
F) A) and C)

Question 13

Study the figure at right.What does the letter A depict?

Accepted Answer

A)  Energy of the reactant
B)  Energy of the products
C)  Energy of activation
D)  Substrate concentrationE) A) and C)
F) All of the above

Question 14

The energy for ATP synthesis in chemiosmotic phosphorylation comes from the movement of hydrogen ions across a membrane down a concentration gradient.

Accepted Answer

A) True 
 B)False

Question 15

If a change in pH alters an allosteric site where an inhibitor binds,but doesn't change the active site for the intended substrate,it would be possible for an enzymatically controlled reaction to occur as normal.

Accepted Answer

A) True 
 B)False

Question 16

ATP is considered a high-energy compound because under cellular conditions,7.3 kcal per mole of energy is released when a bond is broken between:

Accepted Answer

A)  the base adenine and the sugar ribose.
B)  the adenosine and the phosphate groups.
C)  the base adenine and the phosphate groups.
D)  the adenosine diphosphate and the third phosphate.
E)  All of the bonds release energy as ATP is completely broken down.F) A) and D)
G) A) and E)

Question 17

Which statement is NOT true about how various conditions will effect the activity of an enzyme?

Accepted Answer

A)  Higher temperatures generally increase the activity of an enzyme up to a point.
B)  Above a certain range of temperatures,the protein of an enzyme is denatured.
C)  A change in pH can cause an enzyme to be inactivated.
D)  An enzyme's activity is generally reduced by an increase in substrate concentration.
E)  When sufficient substrate is available,the active site will nearly always be occupied.F) B) and E)
G) A) and E)

Question 18

While we are sitting down to lunch we are consuming _______ energy which will then be converted into ______ energy as we work until dinner time.

Accepted Answer

A)  potential,kinetic
B)  kinetic,potential
C)  kinetic,free
D)  potential,storedE) A) and C)
F) B) and D)

Question 19

In the electron transport systems of chloroplasts and mitochondria,

Accepted Answer

A)  the system consists of a series of membrane bound carriers that transfer electrons from one carrier to another.
B)  high energy electrons enter the system and low energy electrons exit the system.
C)  energy release occurs when the electron transfers from one carrier to another.
D)  All of the choices are correct.E) A) and B)
F) A) and D)

Question 20

ATP is considered to be

Accepted Answer

A)  an enzyme used widely in all kinds of cells.
B)  a coenzyme used to inhibit or activate different enzymes.
C)  a molecule that carries a great deal of chemical energy in a chemical bond.
D)  the precursor of a high-energy membrane-bounded protein.E) C) and D)
F) All of the above

Exam 6: Metabolism: Energy and Enzymes

While we are sitting down to lunch we are consuming _ energy which will then be converted into energy as we work until dinner time.

Correct Answer
verified

ATP is considered a high-energy compound because under cellular conditions,7.3 kcal per mole of energy is released when a bond is broken between:

Correct Answer
verified

An enzyme is a globular protein that inhibits the formation of chemical bonds within the enzyme's substrate(s)causing the rate of the reaction to slow down.

Correct Answer
verified

The energy for ATP synthesis in chemiosmotic phosphorylation comes from the movement of hydrogen ions across a membrane down a concentration gradient.

Correct Answer
verified

Which of the following is consistent with the laws of physics governing energy?

Correct Answer
verified

In the electron transport systems of chloroplasts and mitochondria,

Correct Answer
verified

If a change in pH alters an allosteric site where an inhibitor binds,but doesn't change the active site for the intended substrate,it would be possible for an enzymatically controlled reaction to occur as normal.

Correct Answer
verified

Correct Answer
verified

ATP is considered to be

Correct Answer
verified

During the conversion of glucose into a free form of energy only a small percentage is converted into useable ATP.What is the rest of the energy converted into?

Correct Answer
verified

Study the figure at right.What does the letter A depict?

Correct Answer
verified

Which of the following labels is incorrectly identified.

Correct Answer
verified

Which statement describes the currently accepted theory of how an enzyme and its substrate fit together?

Correct Answer
verified

Which statement is NOT true about how various conditions will effect the activity of an enzyme?

Correct Answer
verified

An automobile engine is about 20 - 30% efficient in converting chemical energy to mechanical energy.Cells are about 39% efficient in the transformation of glucose to ATP.The rest of the energy is lost as heat.This is illustrative of the:

Correct Answer
verified

Endergonic reactions:

Correct Answer
verified

Which of these statements is NOT a consequence of the second law of thermodynamics?

Correct Answer
verified

Astrophysicists explain that eventually the sun will swell to become a red giant,engulf the earth and "burn out" with all forms of energy dispersing in a final "heat death." Compared with conditions today,the entropy of the universe then will

Correct Answer
verified

Study the graph at right.The letter 'B ' depicts the _,while 'C' depicts ____.

Correct Answer
verified

Coupling occurs when the energy released by an exergonic reaction is:

Correct Answer
verified

Exam 6: Metabolism: Energy and Enzymes

While we are sitting down to lunch we are consuming _______ energy which will then be converted into ______ energy as we work until dinner time.

Correct AnswerverifiedShow Answer

ATP is considered a high-energy compound because under cellular conditions,7.3 kcal per mole of energy is released when a bond is broken between:

Correct AnswerverifiedShow Answer

An enzyme is a globular protein that inhibits the formation of chemical bonds within the enzyme's substrate(s)causing the rate of the reaction to slow down.

Correct AnswerverifiedShow Answer

The energy for ATP synthesis in chemiosmotic phosphorylation comes from the movement of hydrogen ions across a membrane down a concentration gradient.

Correct AnswerverifiedShow Answer

Which of the following is consistent with the laws of physics governing energy?

Correct AnswerverifiedShow Answer

In the electron transport systems of chloroplasts and mitochondria,

Correct AnswerverifiedShow Answer

If a change in pH alters an allosteric site where an inhibitor binds,but doesn't change the active site for the intended substrate,it would be possible for an enzymatically controlled reaction to occur as normal.

Correct AnswerverifiedShow Answer

In this pathway,B →\rightarrow→ C is coupled with ADP →\rightarrow→ ATP.Categorize the reactions as endergonic or exergonic.

Correct AnswerverifiedShow Answer

ATP is considered to be

Correct AnswerverifiedShow Answer

During the conversion of glucose into a free form of energy only a small percentage is converted into useable ATP.What is the rest of the energy converted into?

Correct AnswerverifiedShow Answer

Study the figure at right.What does the letter A depict?

Correct AnswerverifiedShow Answer

Which of the following labels is incorrectly identified.

Correct AnswerverifiedShow Answer

Which statement describes the currently accepted theory of how an enzyme and its substrate fit together?

Correct AnswerverifiedShow Answer

Which statement is NOT true about how various conditions will effect the activity of an enzyme?

Correct AnswerverifiedShow Answer

An automobile engine is about 20 - 30% efficient in converting chemical energy to mechanical energy.Cells are about 39% efficient in the transformation of glucose to ATP.The rest of the energy is lost as heat.This is illustrative of the:

Correct AnswerverifiedShow Answer

Endergonic reactions:

Correct AnswerverifiedShow Answer

Which of these statements is NOT a consequence of the second law of thermodynamics?

Correct AnswerverifiedShow Answer

Astrophysicists explain that eventually the sun will swell to become a red giant,engulf the earth and "burn out" with all forms of energy dispersing in a final "heat death." Compared with conditions today,the entropy of the universe then will

Correct AnswerverifiedShow Answer

Study the graph at right.The letter 'B ' depicts the _____,while 'C' depicts ________.

Correct AnswerverifiedShow Answer

Coupling occurs when the energy released by an exergonic reaction is:

Correct AnswerverifiedShow Answer

While we are sitting down to lunch we are consuming _ energy which will then be converted into energy as we work until dinner time.

Correct Answer
verified

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Study the graph at right.The letter 'B ' depicts the _,while 'C' depicts ____.

Correct Answer
verified

Correct Answer
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