Question 1

To prevent depletion of a substrate,the product of a metabolic pathway will

Accepted Answer

A)  turn off an enzyme early in the pathway.
B)  catalyze its own production.
C)  increase enzyme activity through positive feedback.
D)  occupy the active site of an enzyme early in the pathway.E) A) and B)
F) B) and C)

Question 2

Enzymes that remove phosphate groups from their substrates are called __________.

Accepted Answer

phosphatas...

Question 3

A large decrease in pH results in increased H+binding to an enzyme,which can disrupt electrostatic interactions within the molecule.

Accepted Answer

A) True 
 B)False

Question 4

Lactose intolerance is caused by the lack of the enzyme lactase,which is normally found in the

Accepted Answer

A)  lumen of the stomach.
B)  inside of cells of the liver and gall bladder.
C)  membranes of cells in the small intestine.
D)  inside of cells in the large intestine.
E)  endothelium of capillaries in the large intestine.F) D) and E)
G) A) and B)

Question 5

If oxygen is in short supply,the activity of the electron transport chain increases in order to compensate.

Accepted Answer

A) True 
 B)False

Question 6

__________ is a monomer that is stored as the polymer glycogen within the liver and muscle.

Accepted Answer

The answer of __________ is a monomer that is stored...

Question 7

In a lab setting,heating a vessel full of reactants will generally

Accepted Answer

A)  increase the kinetic energy of the molecules and increase the reaction rate.
B)  raise the activation energy and catalyze the reaction.
C)  lower the activation energy and the kinetic energy of the reactants.
D)  convert products to reactants by increasing the energy requirements.
E)  lower the reaction rate due to the change in structure of the reactants.F) All of the above
G) B) and E)

Question 8

Enzyme saturation occurs when substrate levels are so high that all enzyme molecules are actively engaged in the chemical reaction,and so further increases in substrate concentration do not increase reaction rate.

Accepted Answer

A) True 
 B)False

Question 9

Structurally,enzymes are generally

Accepted Answer

A)  globular proteins.
B)  fibrous proteins.
C)  spherical carbohydrates.
D)  elongated carbohydrates.
E)  four-ring steroids.F) A) and B)
G) D) and E)

Question 10

The indirect method of ATP production involves coenzymes such as FAD and is referred to as _________ phosphorylation.

Accepted Answer

The answer of The indirect method of ATP production involves...

Question 11

The less acidic (more basic)the environment is,the more efficient an enzyme will be.

Accepted Answer

A) True 
 B)False

Question 12

If insufficient oxygen is available for the anaerobic breakdown of pyruvate,it is converted to _________.

Accepted Answer

The answer of If insufficient oxygen is available for the...

Question 13

The more common way that ATP is produced in cells is

Accepted Answer

A)  the indirect pathway known as oxidative phosphorylation.
B)  the indirect pathway known as substrate-level phosphorylation.
C)  the direct pathway known as oxidative phosphorylation.
D)  the direct pathway known as substrate-level phosphorylation.E) C) and D)
F) B) and C)

Question 14

Which stage of cellular respiration is catalyzed by pyruvate dehydrogenase

Accepted Answer

A)  Electron transport system
B)  Intermediate stage
C)  Citric acid cycle
D)  Glycolysis
E)  Fermentation to lactateF) B) and C)
G) A) and E)

Question 15

The optimal pH range for the stomach enzyme pepsin is

Accepted Answer

A)  2-4.
B)  6-8.
C)  7.3-7.4.
D)  10-12.
E)  12.0-13.5.F) B) and C)
G) A) and D)

Question 16

A group of enzymes that are physically attached to one another is referred to as a(n)

Accepted Answer

A)  allosteric pathway.
B)  metabolic pathway.
C)  multienzyme complex.
D)  phosphate complex.E) B) and D)
F) All of the above

Question 17

The first stage of cellular respiration is

Accepted Answer

A)  electron transport,and it occurs in the cytosol.
B)  electron transport,and it occurs in the mitochondria.
C)  glycolysis,and it occurs in the cytosol.
D)  glycolysis,and it occurs in the mitochondria.
E)  the citric acid cycle,and it occurs at the mitochondria.F) A) and B)
G) A) and D)

Question 18

The propagation of an impulse along the axon of a neuron is considered electrical energy,a form of kinetic energy.

Accepted Answer

A) True 
 B)False

Question 19

An enzyme that is described as a protein kinase is a

Accepted Answer

A)  hydrolase that removes an amino acid from a protein.
B)  transferase that transfers a phosphate group to a protein substrate.
C)  ligase that adds an amino acid to a protein.
D)  isomerase that changes one protein into another.
E)  protease that transfers electrons from one protein to another.F) B) and E)
G) B) and D)

Question 20

One turn of the citric acid cycle results in the formation of

Accepted Answer

A)  1 ATP,3 NADH,and 1 FADH2.
B)  2 pyruvates and 2 ATP.
C)  2 ATP,2 NADH+,and 3 FADH.
D)  2 citrates,4 ATP,and 3 FADH2.E) B) and C)
F) None of the above

Exam 3: Energy,Chemical Reactions,and Cellular Respiration

The optimal pH range for the stomach enzyme pepsin is

Correct AnswerverifiedShow Answer

If oxygen is in short supply,the activity of the electron transport chain increases in order to compensate.

Correct AnswerverifiedShow Answer

To prevent depletion of a substrate,the product of a metabolic pathway will

Correct AnswerverifiedShow Answer

The propagation of an impulse along the axon of a neuron is considered electrical energy,a form of kinetic energy.

Correct AnswerverifiedShow Answer

Enzymes that remove phosphate groups from their substrates are called __________.

Correct Answerverifiedphosphatas...View AnswerShow Answer

The indirect method of ATP production involves coenzymes such as FAD and is referred to as _________ phosphorylation.

Correct AnswerverifiedShow Answer

Which stage of cellular respiration is catalyzed by pyruvate dehydrogenase

Correct AnswerverifiedShow Answer

One turn of the citric acid cycle results in the formation of

Correct AnswerverifiedShow Answer

Structurally,enzymes are generally

Correct AnswerverifiedShow Answer

Lactose intolerance is caused by the lack of the enzyme lactase,which is normally found in the

Correct AnswerverifiedShow Answer

A large decrease in pH results in increased H+binding to an enzyme,which can disrupt electrostatic interactions within the molecule.

Correct AnswerverifiedShow Answer

An enzyme that is described as a protein kinase is a

Correct AnswerverifiedShow Answer

Enzyme saturation occurs when substrate levels are so high that all enzyme molecules are actively engaged in the chemical reaction,and so further increases in substrate concentration do not increase reaction rate.

Correct AnswerverifiedShow Answer

A group of enzymes that are physically attached to one another is referred to as a(n)

Correct AnswerverifiedShow Answer

In a lab setting,heating a vessel full of reactants will generally

Correct AnswerverifiedShow Answer

__________ is a monomer that is stored as the polymer glycogen within the liver and muscle.

Correct AnswerverifiedShow Answer

The more common way that ATP is produced in cells is

Correct AnswerverifiedShow Answer

If insufficient oxygen is available for the anaerobic breakdown of pyruvate,it is converted to _________.

Correct AnswerverifiedShow Answer

The first stage of cellular respiration is

Correct AnswerverifiedShow Answer

The less acidic (more basic)the environment is,the more efficient an enzyme will be.

Correct AnswerverifiedShow Answer

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A large decrease in pH results in increased H⁺binding to an enzyme,which can disrupt electrostatic interactions within the molecule.

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