Question 1

Which enzyme system allows for regulation at a single site and also diminishes the chance that a needed substrate will diffuse away from a catalyst

Accepted Answer

A)  Metabolic pathway
B)  Multienzyme complexC) A) and B)
D) undefined

Question 2

Which enzyme class transfers electrons from one substance to another

Accepted Answer

A)  Oxidoreductase
B)  Transferase
C)  Isomerase
D)  Ligase
E)  ElectinF) A) and D)
G) A) and B)

Question 3

The electron transport chain

Accepted Answer

A)  does not require oxygen,and involves proteins in the outer membrane of mitochondria.
B)  does not require oxygen,and involves proteins in the cristae of mitochondria.
C)  requires oxygen,and involves proteins in the outer membrane of mitochondria.
D)  requires oxygen,and involves proteins in the cristae of mitochondria.E) B) and D)
F) A) and B)

Question 4

During cellular respiration,decarboxylation occurs when

Accepted Answer

A)  a carbon atom is removed from glucose.
B)  a carbon dioxide molecule is removed from the cytosol.
C)  a carboxyl group is released from pyruvate.
D)  a carbon atom is removed from and an oxygen atom is added to fructose.
E)  all carbon and oxygen atoms are released from a high-energy molecule.F) C) and E)
G) A) and B)

Question 5

The total number of ATP generated by the breakdown of glucose is 38,but the net number of ATP generated is

Accepted Answer

A)  2.
B)  24.
C)  30.
D)  36.
E)  40.F) C) and D)
G) A) and C)

Question 6

When an enzyme's conformational change results in the enzyme hugging the substrate in its active site,the action is referred to as the __________ model of enzyme function.or

Accepted Answer

induced-fi...

Question 7

When an enzyme catalyzing a catabolic reaction changes conformation to an induced fit with the substrate,

Accepted Answer

A)  it strengthens the chemical bonds in the enzyme so that it remains perpetually active.
B)  it stresses chemical bonds in the substrate,making it easier to break them.
C)  it strengthens chemical bonds in the substrate so that cofactors can act on it.
D)  it stresses chemical bonds in the enzyme so that the enzyme breaks into two catalytic subunits.E) A) and C)
F) C) and D)

Question 8

Cofactors are generally proteins.

Accepted Answer

A) True 
 B)False

Question 9

All amino acids enter the cellular respiration pathway at the citric acid cycle.

Accepted Answer

A) True 
 B)False

Question 10

The proteins in the electron transport chain transport H+

Accepted Answer

A)  from the cytosol to the matrix.
B)  from the matrix to the outer compartment.
C)  from the outer compartment to the cytosol.
D)  from the outer compartment to the matrix.
E)  from the cristae to the matrix.F) A) and E)
G) A) and D)

Question 11

Enzyme regulation by negative feedback involves

Accepted Answer

A)  allosteric inhibition of an enzyme by a product of its metabolic pathway.
B)  allosteric facilitation of an enzyme by a substrate of its metabolic pathway.
C)  allosteric modification of a substrate by an enzyme of an alternate metabolic pathway.
D)  occupation of the active site of an enzyme so that it catalyzes less efficiently.
E)  enhancement of the active site by a negatively charged substrate.F) C) and E)
G) A) and B)

Question 12

In the process of glycolysis

Accepted Answer

A)  one enzyme converts glucose into NADH.
B)  two enzymes are involved in breaking glucose down to ten pyruvate molecules.
C)  ten enzymes are involved in breaking glucose down to two pyruvate molecules.
D)  twelve enzymes split glucose into thirteen smaller molecules.
E)  six enzymes use two ATP to split glucose in half.F) B) and D)
G) None of the above

Question 13

Which answer lists the steps of enzyme action in correct order

Accepted Answer

A)  Formation of enzyme-substrate complex,induced fit,formation or breakage of chemical bonds,release of product
B)  Induced fit,formation of enzyme-substrate complex,formation or breakage of chemical bonds,release of product
C)  Formation or breakage of chemical bonds,induced fit,formation of enzyme-substrate complex,release of substrate
D)  Induced fit,formation or breakage of chemical bonds,formation of enzyme-substrate complex,release of productE) A) and D)
F) A) and B)

Question 14

The term "activation energy" refers to the amount of energy

Accepted Answer

A)  released by an exergonic reaction.
B)  released by an endergonic reaction.
C)  released by a catabolic reaction.
D)  required to initiate any chemical reaction.
E)  required to initiate only catabolic reactions.F) A) and B)
G) B) and E)

Question 15

In the final step of enzymatic catalysis,

Accepted Answer

A)  the substrate is released and the enzyme is inactivated.
B)  the product is completed and the enzyme is inactivated.
C)  the products are released and the enzyme is free to bind other substrates.
D)  the enzyme and substrate form chemical bonds with each other resulting in a new product.
E)  equilibrium is obtained so that the enzyme does not catalyze further reactions.F) A) and D)
G) A) and E)

Question 16

When one glucose molecule is fully oxidized,how many molecules of CO2result

Accepted Answer

A)  1
B)  2
C)  3
D)  6E) C) and D)
F) A) and C)

Question 17

Extremely high temperatures break intramolecular interactions and _________ an enzyme,resulting in a loss of its function.

Accepted Answer

The answer of Extremely high temperatures break intramolecular interactions and...

Question 18

When NAD+becomes NADH,it is being

Accepted Answer

A)  reduced and gaining chemical energy.
B)  reduced and releasing chemical energy.
C)  oxidized and gaining chemical energy.
D)  oxidized and releasing chemical energy.E) A) and B)
F) B) and D)

Question 19

Pyruvate dehydrogenase is a multienzyme complex that brings together a molecule of pyruvate and a molecule of coenzyme A.

Accepted Answer

A) True 
 B)False

Question 20

When multiple enzymes are organized in a metabolic pathway,each enzyme catalyzes one reaction and then releases the product.

Accepted Answer

A) True 
 B)False

Exam 3: Energy,Chemical Reactions,and Cellular Respiration

When NAD+becomes NADH,it is being

Correct AnswerverifiedShow Answer

When an enzyme's conformational change results in the enzyme hugging the substrate in its active site,the action is referred to as the __________ model of enzyme function.or

Correct Answerverifiedinduced-fi...View AnswerShow Answer

When multiple enzymes are organized in a metabolic pathway,each enzyme catalyzes one reaction and then releases the product.

Correct AnswerverifiedShow Answer

Which answer lists the steps of enzyme action in correct order

Correct AnswerverifiedShow Answer

When one glucose molecule is fully oxidized,how many molecules of CO2result

Correct AnswerverifiedShow Answer

During cellular respiration,decarboxylation occurs when

Correct AnswerverifiedShow Answer

When an enzyme catalyzing a catabolic reaction changes conformation to an induced fit with the substrate,

Correct AnswerverifiedShow Answer

Pyruvate dehydrogenase is a multienzyme complex that brings together a molecule of pyruvate and a molecule of coenzyme A.

Correct AnswerverifiedShow Answer

The proteins in the electron transport chain transport H+

Correct AnswerverifiedShow Answer

The electron transport chain

Correct AnswerverifiedShow Answer

Which enzyme system allows for regulation at a single site and also diminishes the chance that a needed substrate will diffuse away from a catalyst

Correct AnswerverifiedShow Answer

Extremely high temperatures break intramolecular interactions and _________ an enzyme,resulting in a loss of its function.

Correct AnswerverifiedShow Answer

The total number of ATP generated by the breakdown of glucose is 38,but the net number of ATP generated is

Correct AnswerverifiedShow Answer

The term "activation energy" refers to the amount of energy

Correct AnswerverifiedShow Answer

Cofactors are generally proteins.

Correct AnswerverifiedShow Answer

In the final step of enzymatic catalysis,

Correct AnswerverifiedShow Answer

Which enzyme class transfers electrons from one substance to another

Correct AnswerverifiedShow Answer

In the process of glycolysis

Correct AnswerverifiedShow Answer

All amino acids enter the cellular respiration pathway at the citric acid cycle.

Correct AnswerverifiedShow Answer

Enzyme regulation by negative feedback involves

Correct AnswerverifiedShow Answer

When NAD⁺becomes NADH,it is being

Correct Answer
verified

Correct Answer
verified
induced-fi...
View Answer

Correct Answer
verified

Correct Answer
verified

When one glucose molecule is fully oxidized,how many molecules of CO₂result

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

The proteins in the electron transport chain transport H⁺

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified