Question 1

You return home to find that your baby brother has scattered his toy trains and trucks all over the floor of your room.As you begin to pick up the toys and put them away,you realize that even though he is just a baby,he has clearly mastered

Accepted Answer

A)  the first law of thermodynamics.
B)  the second law of thermodynamics.
C)  potential energy.
D)  free energy.E) A) and B)
F) B) and C)

Question 2

When the substrate is bound to the enzyme,the shape of the enzyme may change slightly,leading to

Accepted Answer

A)  a better induced fit.
B)  a great range of possible catalytic activities.
C)  a greater supply of activation energy.
D)  more permanent binding through intimate total contact.
E)  more possible products of the reaction.F) All of the above
G) A) and D)

Question 3

A molecule that closely resembles the shape of a substrate for an enzyme might serve as a(n)

Accepted Answer

A)  an enzyme
B)  allosteric modulator
C)  competitive inhibitor
D)  pathway blockerE) B) and D)
F) C) and D)

Question 4

Free energy is the amount of energy available for the cell to carry out its many chemical processes.It is the difference between the internal energy or enthalpy and ______ or disorder.

Accepted Answer

A)  free energy
B)  entropy
C)  chaos
D)  heatE) B) and C)
F) B) and D) B

Question 5

Which of the following statements concerning redox reactions are false?

Accepted Answer

A)  The reduced form of a molecule has a higher level of energy than the oxidized form.
B)  Reduction is the gain of an electron,and oxidation is the loss of an electron.
C)  Organisms can derive energy from the oxidation of organic compounds.
D)  Oxidation reactions and reduction reactions occur independently.E) B) and C)
F) A) and D)

Question 6

Each of the significant properties of a cell (its growth,reproduction,and responsiveness to its environment) requires ________.

Accepted Answer

A)  energy
B)  light
C)  mitosis
D)  movementE) B) and C)
F) None of the above

Question 7

Allosteric inhibitor binds here;changes enzyme shape.

Accepted Answer

A)  active site
B)  substrate
C)  coenzyme
D)  non-catalytic binding siteE) All of the above
F) C) and D)

Question 8

Shivering is the result of uncontrollable contractions of skeletal muscle tissue in an effort to increase heat production and raise body temperature.How does this process relate to ATP hydrolysis?

Accepted Answer

A)  ATP is converted directly to heat.
B)  Muscle contractions in the form of shivering produces heat and warms the body.
C)  ATP hydrolysis causes muscle contraction.
D)  Muscle contractions require ATP hydrolysis.Energy is liberated by ATP hydrolysis and converted into heat.E) B) and C)
F) A) and C)

Question 9

In a chemical reaction in a living system,enzymes are used as catalysts.Which of the following statements about enzymes is incorrect?

Accepted Answer

A)  Enzymes enter reactions and can be reused.
B)  Enzymes speed up chemical reactions in living systems.
C)  Enzymes reduce the energy of activation necessary for a chemical reaction to go forward.
D)  Enzymes increase the energy of activation necessary for a chemical reaction to go forwarD.
E)  Enzymes are sometimes referred to as biological catalysts;however,not all biological catalysts are proteins.F) A) and E)
G) A) and D)

Question 10

The chief energy currency of all cells is a molecule called

Accepted Answer

A)  cyclic AMP.
B)  NADH.
C)  FADH.
D)  ATP.
E)  ADP.F) A) and E)
G) A) and D)

Question 11

Life's ultimate source of energy is derived from

Accepted Answer

A)  the sun.
B)  plants.
C)  water.
D)  air.
E)  cells.F) A) and D)
G) A) and E)

Question 12

ATP gives up energy when it is converted to

Accepted Answer

A)  DNA.
B)  NADP.
C)  NADH.
D)  ADP and phosphate.
E)  RNA.F) B) and E)
G) C) and E)

Question 13

If you were able to increase the kinetic energy of the molecules inside your body,your body temperature would

Accepted Answer

A)  increase.
B)  decrease.
C)  remain the same.D) A) and B)
E) None of the above

Question 14

At the conclusion of an enzyme catalyzed reaction,the enzyme

Accepted Answer

A)  must be resynthesized from its amino acids.
B)  frees itself from the product and is ready to be reused.
C)  must be transported from outside of the cell.
D)  changes into an active form.
E)  closes up its active site and cannot bind to more substratE.F) A) and D)
G) A) and E)

Question 15

Enzymes are very specific in their choices of substrates because each different enzyme has an active site that

Accepted Answer

A)  depends on unusual amino acids not common in proteins.
B)  has a certain unique amino acid to fit each substrate.
C)  is shaped to fit a certain substrate molecule.
D)  is lined with glycolipids and glycoproteins.
E)  passes electrons from one part of the substrate to another.F) D) and E)
G) A) and C) C

Question 16

If the  Δ\DeltaΔ G of a reaction was -31.45 kJoules,you would know that

Accepted Answer

A)  the reaction would proceed spontaneously.
B)  the reaction requires an energy input of 31.45 kJoules to proceed.
C)  the products of the reaction have more free energy than the reactants.
D)  it is an energonic reaction. E) A) and D)
F) B) and C)

Question 17

Enzymes work most effectively at

Accepted Answer

A)  their optimum pH and temperature conditions
B)  all pH and temperature conditions
C)  only one temperature and a specific pHD) B) and C)
E) None of the above

Question 18

Protein catalysts that speed up the various metabolic biological reactions in an organism are called

Accepted Answer

A)  substrates.
B)  cofactors.
C)  reactants.
D)  products.
E)  enzymes.F) All of the above
G) A) and E) E

Question 19

Certain key molecules can regulate biochemical pathways by controlling the rates of enzymatic reactions by binding at _________ sites.

Accepted Answer

A)  catalytic
B)  enzymatic
C)  active
D)  allostericE) A) and B)
F) A) and C)

Question 20

The term oxidation is derived from the name of the element oxygen.This is reasonable,because oxygen

Accepted Answer

A)  attracts electrons very strongly.
B)  can be oxidized by accepting electrons.
C)  contains more electrons than are needed.
D)  can react chemically readily in its gas state.
E)  is present everywherE.F) B) and E)
G) C) and D)

Exam 6: Energy and Metabolism

You return home to find that your baby brother has scattered his toy trains and trucks all over the floor of your room.As you begin to pick up the toys and put them away,you realize that even though he is just a baby,he has clearly mastered

Correct AnswerverifiedShow Answer

When the substrate is bound to the enzyme,the shape of the enzyme may change slightly,leading to

Correct AnswerverifiedShow Answer

A molecule that closely resembles the shape of a substrate for an enzyme might serve as a(n)

Correct AnswerverifiedShow Answer

Free energy is the amount of energy available for the cell to carry out its many chemical processes.It is the difference between the internal energy or enthalpy and ______ or disorder.

Correct AnswerverifiedB

Which of the following statements concerning redox reactions are false?

Correct AnswerverifiedShow Answer

Each of the significant properties of a cell (its growth,reproduction,and responsiveness to its environment) requires ________.

Correct AnswerverifiedShow Answer

Allosteric inhibitor binds here;changes enzyme shape.

Correct AnswerverifiedShow Answer

Shivering is the result of uncontrollable contractions of skeletal muscle tissue in an effort to increase heat production and raise body temperature.How does this process relate to ATP hydrolysis?

Correct AnswerverifiedShow Answer

In a chemical reaction in a living system,enzymes are used as catalysts.Which of the following statements about enzymes is incorrect?

Correct AnswerverifiedShow Answer

The chief energy currency of all cells is a molecule called

Correct AnswerverifiedShow Answer

Life's ultimate source of energy is derived from

Correct AnswerverifiedShow Answer

ATP gives up energy when it is converted to

Correct AnswerverifiedShow Answer

If you were able to increase the kinetic energy of the molecules inside your body,your body temperature would

Correct AnswerverifiedShow Answer

At the conclusion of an enzyme catalyzed reaction,the enzyme

Correct AnswerverifiedShow Answer

Enzymes are very specific in their choices of substrates because each different enzyme has an active site that

Correct AnswerverifiedC

If the Δ\DeltaΔ G of a reaction was -31.45 kJoules,you would know that

Correct AnswerverifiedShow Answer

Enzymes work most effectively at

Correct AnswerverifiedShow Answer

Protein catalysts that speed up the various metabolic biological reactions in an organism are called

Correct AnswerverifiedE

Certain key molecules can regulate biochemical pathways by controlling the rates of enzymatic reactions by binding at _________ sites.

Correct AnswerverifiedShow Answer

The term oxidation is derived from the name of the element oxygen.This is reasonable,because oxygen

Correct AnswerverifiedShow Answer

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B

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C

If the $\Delta$ G of a reaction was -31.45 kJoules,you would know that

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E

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