Question 1

While conducting an experiment,you realize that a competitive inhibitor was interfering with your reaction.To overcome this problem,you

Accepted Answer

A)  add a non-competitive inhibitor to the reaction.
B)  decrease the concentration of the correct substrate in the reaction.
C)  increase the concentration of the correct substrate in the reaction.
D)  add an allosteric activator to the reaction.E) A) and B)
F) All of the above

Question 2

The ability of an enzyme to catalyze a reaction is not affected by

Accepted Answer

A)  temperature.
B)  pH.
C)  salt concentration.
D)  binding of specific regulatory molecules.
E)  excess cofactor.F) A) and B)
G) C) and D)

Question 3

While standing at the top of the stairs,you have a potential energy of 40 Joules.If you walk all the way down the stairs,what would your potential energy be at the bottom of the stairs?

Accepted Answer

A)  0 Joules
B)  20 Joules
C)  40 Joules
D)  cannot determine from the information providedE) A) and B)
F) A) and C)

Question 4

The Second Law of Thermodynamics simply states that

Accepted Answer

A)  energy can be recycled through the universe.
B)  energy cannot be created or destroyed,just changed from one form to another.
C)  disorder (or entropy) in the universe is continually increasing.
D)  energy is constantly being created in the universe.
E)  energy can be created but not destroyed.F) All of the above
G) C) and D)

Question 5

Under standard conditions,ATP can release for every molecule converted to ADP

Accepted Answer

A)  less than 1 cal of energy.
B)  1 to 2 cal of energy.
C)  7.3 Kcal of energy.
D)  7.3 cal of energy.
E)  different amounts of energy depending on the cell.F) B) and D)
G) C) and D)

Question 6

Which of the following best depicts a diagram of enzymes and substrates when they react? Assume only forward reactions.Use the following to make your choice: E = enzyme,S = substrate,ES = enzyme-substrate complex,P = products.

Accepted Answer

A)  E + P  →\rarr→  ES
B)  E + S  →\rarr→  ES + P
C)  E + S  →\rarr→  ES  →\rarr→  E + P
D)  E + ES  →\rarr→  P + E
E)  E + P  →\rarr→  EP  →\rarr→  S + E F) None of the above
G) D) and E)

Question 7

The specificity of an enzyme is due to its active site.The active site is shaped so that only a certain

Accepted Answer

A)  substrate molecule can fit into it.
B)  product molecule can fit into it.
C)  reactant molecule can fit into it.
D)  cofactor molecule can fit into it.
E)  histone molecule can fit into it.F) A) and B)
G) A) and C)

Question 8

The regulation of simple biochemical pathways often involves the end-product binding to the allosteric site of the first enzyme in the sequence.This mode of regulation is called

Accepted Answer

A)  competitive inhibition.
B)  biochemical regulation.
C)  cellular control.
D)  product catalysis.
E)  feedback inhibition.F) B) and D)
G) A) and D)

Question 9

In an enzyme catalyzed reaction the reactant is called the

Accepted Answer

A)  ribozyme.
B)  catalyst.
C)  substrate.
D)  end-product.
E)  activator.F) D) and E)
G) A) and C)

Question 10

The First Law of Thermodynamics simply states that

Accepted Answer

A)  energy is constantly being created in the universe.
B)  disorder in the universe is continually increasing.
C)  energy can be created but not destroyed.
D)  energy cannot be created or destroyed,just changed from one form to another.
E)  energy can be recycled through the universE.F) None of the above
G) A) and D)

Question 11

Reactions that occur spontaneously and release free energy are called _____________ reactions.

Accepted Answer

A)  activation
B)  exergonic
C)  catabolistic
D)  thermodynamic
E)  endergonicF) B) and C)
G) A) and C)

Question 12

Molecules that act as catalysts in biological systems are

Accepted Answer

A)  ATP.
B)  cofactors.
C)  coenzymes.
D)  enzymes.
E)  genes.F) A) and B)
G) C) and D)

Question 13

One of the most important coenzymes that accepts electrons/hydrogens is

Accepted Answer

A)  NAD+.
B)  NADH.
C)  ATP.
D)  NADPH.
E)  ribozymE.F) B) and D)
G) C) and D)

Question 14

Enzymes have specific ________ with which they interact.

Accepted Answer

A)  products
B)  substrates
C)  reactants
D)  atoms
E)  end-productsF) A) and B)
G) A) and C)

Question 15

A calorie is the commonly used unit of chemical energy.It is also the unit of

Accepted Answer

A)  light.
B)  magnetism.
C)  sound.
D)  heat.
E)  radioactivity.F) A) and E)
G) A) and C)

Question 16

Most protein-enzymes are

Accepted Answer

A)  fibrous proteins.
B)  hormones.
C)  histones.
D)  metalloenzymes.
E)  globular proteins.F) D) and E)
G) None of the above

Question 17

Which of the following scenarios would not result in a decrease in free energy?

Accepted Answer

A)  Enthalpy increases and entropy decreases.
B)  Enthalpy decreases and entropy increases.
C)  Enthalpy increases,but entropy increase outweighs increase in enthalpy.
D)  Enthalpy decreases enough to outweigh a slight decrease in entropy.E) A) and B)
F) A) and C)

Question 18

Spot where raw material binds and is changed to product.

Accepted Answer

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

Question 19

The Gibbs free energy equation,G = H - TS,interrelates

Accepted Answer

A)  free energy and entropy.
B)  free energy and enthalpy.
C)  free energy and standard temperature.
D)  entropy and enthalpy.E) B) and D)
F) A) and D)

Question 20

A researcher wants to slow down a particular cellular activity by controlling an enzyme that catalyzes that activity.All of the following choices are available except

Accepted Answer

A)  increasing the temperature of the cell's environment.
B)  decreasing the temperature of the cell's environment.
C)  reducing the pH of the cell's environment.
D)  increasing the pH of the cell's environment.
E)  adding substrate as it is depleted to the cell's environment.F) C) and D)
G) A) and E)

Exam 6: Energy and Metabolism

Most protein-enzymes are

Correct AnswerverifiedShow Answer

Spot where raw material binds and is changed to product.

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Enzymes have specific ________ with which they interact.

Correct AnswerverifiedShow Answer

The Gibbs free energy equation,G = H - TS,interrelates

Correct AnswerverifiedShow Answer

Molecules that act as catalysts in biological systems are

Correct AnswerverifiedShow Answer

Which of the following scenarios would not result in a decrease in free energy?

Correct AnswerverifiedShow Answer

One of the most important coenzymes that accepts electrons/hydrogens is

Correct AnswerverifiedShow Answer

While conducting an experiment,you realize that a competitive inhibitor was interfering with your reaction.To overcome this problem,you

Correct AnswerverifiedShow Answer

The ability of an enzyme to catalyze a reaction is not affected by

Correct AnswerverifiedShow Answer

Under standard conditions,ATP can release for every molecule converted to ADP

Correct AnswerverifiedShow Answer

The specificity of an enzyme is due to its active site.The active site is shaped so that only a certain

Correct AnswerverifiedShow Answer

The Second Law of Thermodynamics simply states that

Correct AnswerverifiedShow Answer

A calorie is the commonly used unit of chemical energy.It is also the unit of

Correct AnswerverifiedShow Answer

Reactions that occur spontaneously and release free energy are called _____________ reactions.

Correct AnswerverifiedShow Answer

A researcher wants to slow down a particular cellular activity by controlling an enzyme that catalyzes that activity.All of the following choices are available except

Correct AnswerverifiedShow Answer

Which of the following best depicts a diagram of enzymes and substrates when they react? Assume only forward reactions.Use the following to make your choice: E = enzyme,S = substrate,ES = enzyme-substrate complex,P = products.

Correct AnswerverifiedShow Answer

The First Law of Thermodynamics simply states that

Correct AnswerverifiedShow Answer

In an enzyme catalyzed reaction the reactant is called the

Correct AnswerverifiedShow Answer

While standing at the top of the stairs,you have a potential energy of 40 Joules.If you walk all the way down the stairs,what would your potential energy be at the bottom of the stairs?

Correct AnswerverifiedShow Answer

The regulation of simple biochemical pathways often involves the end-product binding to the allosteric site of the first enzyme in the sequence.This mode of regulation is called

Correct AnswerverifiedShow Answer

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