Question 1

In the hypothetical biochemical pathway,P → Q + R → S → T,which step is likely to have evolved first?

Accepted Answer

A)  P → Q
B)  Q + R
C)  R → S
D)  S → TE) All of the above
F) A) and B)

Question 2

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)  different amounts of energy depending on the cell.E) C) and D)
F) None of the above

Question 3

A new antibiotic has been developed.It acts as a noncompetitive inhibitor of an enzyme.How will this antibiotic affect delta G for the reaction that is catalyzed by the enzyme?

Accepted Answer

A)  Delta G will increase
B)  Delta G will decrease
C)  Delta G will be unaffectedD) All of the above
E) B) and C)

Question 4

Hexokinase is an enzyme that binds specifically to glucose and converts it into glucose 6-phosphate.The activity of hexokinase is suppressed by glucose 6-phosphate,which binds to hexokinase at a location that is distinct from the active site.This is an example of.

Accepted Answer

A)  feedback inhibition.
B)  competitive inhibition.
C)  cofactor binding.
D)  allosteric activation.E) A) and C)
F) B) and C)

Question 5

If the ΔG of a reaction was -31.45 kJoules,you would know that:

Accepted Answer

A)  the products have more free energy than the reactants.
B)  the reaction requires an energy input of 31.45 kJoules to proceed.
C)  the reaction most likely leads to development of a more ordered system.
D)  the reaction is spontaneous.E) B) and D)
F) B) and C)

Question 6

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

Accepted Answer

A)  Add a noncompetitive inhibitor to the reaction.
B)  Add a cofactor to the reaction.
C)  Increase the concentration of the correct substrate in the reaction.
D)  Add an allosteric activator to the reaction.E) A) and D)
F) None of the above

Question 7

A current problem in modern medicine is the development of drug resistance mutations.This occurs when a mutation arises in a disease-causing microbe making it resistant to a drug and thus rendering the drug useless in treating a specific disease.Many useful drugs are competitive inhibitors of specific enzymes,and the drug-resistance mutations prevent the binding of the drug.These types of mutations,in addition to preventing competitive inhibitor binding,can also sometimes reduce the activity of the enzyme.Why is that the case?

Accepted Answer

A)  Binding to the competitive inhibitor is essential for the function of the enzyme
B)  These mutations most likely affect an allosteric site on the enzyme
C)  These mutations lower the activation energy of the reaction catalyzed by the enzyme
D)  These mutations most likely change the shape of the active site of the enzymeE) A) and B)
F) A) and C)

Question 8

A particular chemical reaction is exergonic.What can you say about the relationship between the reactants and the products in this exergonic reaction?

Accepted Answer

A)  The reactants have more free energy than the products
B)  The reactants are likely more disordered and the products are likely more ordered
C)  The reactants cannot spontaneously react to generate the products
D)  The reactants likely have lower enthalpy than the productsE) All of the above
F) A) and C)

Question 9

Enzyme 1 converts substrate A into product B.Is this an example of a metabolic pathway?

Accepted Answer

A)  Yes.This is a metabolic pathway that includes feedback inhibition.
B)  No.This only describes one chemical reaction.A metabolic pathway includes multiple chemical reactions.
C)  Yes.This is a simple metabolic pathway.
D)  No.A metabolic pathway must include an inhibitory step.E) A) and C)
F) B) and C)

Question 10

In a chemical reaction,glyceraldehyde-3-phosphate + NAD+ yields 1,3-bisphosphoglycerate + NADH.In this reaction,what happened to NAD+?

Accepted Answer

A)  It was oxidized to form NADH
B)  It was reduced to form NADH
C)  It was activated to form NADH
D)  it served as an enzyme to catalyze the reaction,and at the end of the reaction formed NADHE) B) and D)
F) B) and C)

Question 11

The energy needed to destabilize existing chemical bonds and start a chemical reaction is called

Accepted Answer

A)  activation energy
B)  free energy
C)  kinetic energy
D)  potential energyE) A) and D)
F) A) and C)

Question 12

A drug binds to the active site of an enzyme.If it is bound to the active site of the enzyme,it prevents substrate binding.This drug would be considered a(n)

Accepted Answer

A)  noncompetitive inhibitor.
B)  allosteric inhibitor.
C)  allosteric activator.
D)  competitive inhibitor.E) A) and C)
F) B) and C)

Question 13

In an enzyme-catalyzed reaction,the reactant is called the

Accepted Answer

A)  coenzyme
B)  catalyst
C)  substrate
D)  productE) A) and D)
F) All of the above

Exam 6: Energy and Metabolism

Hexokinase is an enzyme that binds specifically to glucose and converts it into glucose 6-phosphate.The activity of hexokinase is suppressed by glucose 6-phosphate,which binds to hexokinase at a location that is distinct from the active site.This is an example of.

Correct Answer
verified

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

Correct Answer
verified

A particular chemical reaction is exergonic.What can you say about the relationship between the reactants and the products in this exergonic reaction?

Correct Answer
verified

Enzyme 1 converts substrate A into product B.Is this an example of a metabolic pathway?

Correct Answer
verified

A new antibiotic has been developed.It acts as a noncompetitive inhibitor of an enzyme.How will this antibiotic affect delta G for the reaction that is catalyzed by the enzyme?

Correct Answer
verified

The energy needed to destabilize existing chemical bonds and start a chemical reaction is called

Correct Answer
verified

If the ΔG of a reaction was -31.45 kJoules,you would know that:

Correct Answer
verified

Correct Answer
verified

In a chemical reaction,glyceraldehyde-3-phosphate + NAD⁺ yields 1,3-bisphosphoglycerate + NADH.In this reaction,what happened to NAD⁺?

Correct Answer
verified

A drug binds to the active site of an enzyme.If it is bound to the active site of the enzyme,it prevents substrate binding.This drug would be considered a(n)

Correct Answer
verified

In the hypothetical biochemical pathway,P → Q + R → S → T,which step is likely to have evolved first?

Correct Answer
verified

In an enzyme-catalyzed reaction,the reactant is called the

Correct Answer
verified

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

Correct Answer
verified

Exam 6: Energy and Metabolism

Hexokinase is an enzyme that binds specifically to glucose and converts it into glucose 6-phosphate.The activity of hexokinase is suppressed by glucose 6-phosphate,which binds to hexokinase at a location that is distinct from the active site.This is an example of.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

A particular chemical reaction is exergonic.What can you say about the relationship between the reactants and the products in this exergonic reaction?

Correct AnswerverifiedShow Answer

Enzyme 1 converts substrate A into product B.Is this an example of a metabolic pathway?

Correct AnswerverifiedShow Answer

A new antibiotic has been developed.It acts as a noncompetitive inhibitor of an enzyme.How will this antibiotic affect delta G for the reaction that is catalyzed by the enzyme?

Correct AnswerverifiedShow Answer

The energy needed to destabilize existing chemical bonds and start a chemical reaction is called

Correct AnswerverifiedShow Answer

If the ΔG of a reaction was -31.45 kJoules,you would know that:

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

In a chemical reaction,glyceraldehyde-3-phosphate + NAD+ yields 1,3-bisphosphoglycerate + NADH.In this reaction,what happened to NAD+?

Correct AnswerverifiedShow Answer

A drug binds to the active site of an enzyme.If it is bound to the active site of the enzyme,it prevents substrate binding.This drug would be considered a(n)

Correct AnswerverifiedShow Answer

In the hypothetical biochemical pathway,P → Q + R → S → T,which step is likely to have evolved first?

Correct AnswerverifiedShow Answer

In an enzyme-catalyzed reaction,the reactant is called the

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

In a chemical reaction,glyceraldehyde-3-phosphate + NAD⁺ yields 1,3-bisphosphoglycerate + NADH.In this reaction,what happened to NAD⁺?

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified