Question 1

Exergonic reactions do not require activation energy.

Accepted Answer

A) True 
 B)False

Question 2

When we shiver on a cold day,the heat produced by muscle tissue is a demonstration of

Accepted Answer

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

Question 3

The first law of thermodynamics states that once energy is consumed,it can no longer be converted to any other form of energy.

Accepted Answer

A) True 
 B)False  False

Question 4

The exchange of a phosphate group between creatine phosphate and adenosine diphosphate is categorized as a catabolic (rather than anabolic)reaction.

Accepted Answer

A) True 
 B)False

Question 5

Noncompetitive inhibition of an enzyme occurs when the inhibitor binds to the

Accepted Answer

A)  allosteric site,and its effectiveness is not influenced by substrate concentration.
B)  allosteric site,and its effectiveness depends on substrate concentration.
C)  active site,and its effectiveness is not influenced by substrate concentration.
D)  active site,and its effectiveness depends on substrate concentration.
E)  substrate,and its effectiveness depends on product concentration.F) None of the above
G) B) and E)

Question 6

The intermediate stage of cellular respiration

Accepted Answer

A)  produces ATP and occurs in the cytosol.
B)  produces carbon dioxide and occurs in the mitochondria.
C)  requires Coenzyme A and occurs in the cytosol.
D)  produces pyruvate and occurs in the mitochondria.E) A) and C)
F) A) and D)

Question 7

During the citric acid cycle,an acetyl CoA molecule produced in the intermediate stage combines with a molecule of

Accepted Answer

A)  oxaloacetic acid.
B)  pyruvate.
C)  citrate.
D)  succinate.E) B) and C)
F) All of the above A

Question 8

Which enzyme class splits a chemical bond in the absence of water

Accepted Answer

A)  Ligase
B)  Oxidoreductase
C)  Lyase
D)  Hydrolase
E)  DehydrogenaseF) A) and D)
G) A) and E)

Question 9

The energy stored in a molecule's chemical bonds is a form of kinetic energy.

Accepted Answer

A) True 
 B)False

Question 10

Glycolysis requires oxygen.

Accepted Answer

A) True 
 B)False

Question 11

The term "metabolism" refers to

Accepted Answer

A)  reactions involving the breakdown of complex molecules into simpler ones.
B)  reactions involving the breakdown of complex molecules or the exchange of atoms between similarly sized reactants.
C)  all the chemical reactions in the body.
D)  reactions involving the synthesis of complex molecules from simpler ones.
E)  digestive system reactions that are either catabolic or exchange reactions.F) B) and E)
G) A) and E)

Question 12

Generally,a decrease in substrate concentration leads to an increase in reaction rate.

Accepted Answer

A) True 
 B)False

Question 13

Fatty acids enter the cell respiration pathway at

Accepted Answer

A)  the citric acid cycle,once they have been converted to acetyl CoA.
B)  glycolysis,once they have been converted to glucose.
C)  electron transport chain,once they have been converted to NADH.
D)  the intermediate stage,once they have been converted to pyruvate.E) All of the above
F) A) and C)

Question 14

Organic cofactors are referred to as _________.

Accepted Answer

The answer of Organic cofactors are referred to as _________....

Question 15

Enzymes are biological catalysts that are crucial for normal human metabolism.

Accepted Answer

A) True 
 B)False

Question 16

A fever of 101 ∘\circ∘ F causes most enzymes in the human body

Accepted Answer

A)  to denature.
B)  to become more rigid.
C)  to be more flexible and efficient.
D)  to saturate. E) C) and D)
F) A) and B)

Question 17

A protein kinase is an enzyme that adds a phosphate to its substrate.

Accepted Answer

A) True 
 B)False

Question 18

When our inner ears convert sound energy into neural impulses or our retinas convert light into neural impulses,

Accepted Answer

A)  no heat is generated,and so it is an exception to the first law of thermodynamics.
B)  it is an exception to both laws of thermodynamics,because no usable energy is lost.
C)  it is consistent with the second law of thermodynamics,but an exception to the first.
D)  the conversion is consistent with both laws of thermodynamics.E) C) and D)
F) None of the above

Question 19

Which of the following choices lists the order of stages of cellular respiration in proper order

Accepted Answer

A)  Glycolysis,intermediate stage,citric acid cycle,and the electron transport system
B)  Citric acid cycle,glycolysis,intermediate stage,and the electron transport system
C)  Glycolysis,citric acid cycle,intermediate stage,and the electron transport system
D)  Glycolysis,intermediate stage,electron transport system,and the citric acid cycle
E)  Citric acid cycle,electron transport chain,intermediate stage,and glycolysisF) All of the above
G) D) and E)

Question 20

The enzyme DNA polymerase is synthesized

Accepted Answer

A)  at a ribosome,and it remains within the cell.
B)  at the rough endoplasmic reticulum,and it is secreted from the cell.
C)  at the Golgi apparatus,and it is embedded in the cell membrane.
D)  in the nucleus,and it is converted to RNA for export outside the cell.E) C) and D)
F) B) and C)

Exam 3: Energy,Chemical Reactions,and Cellular Respiration

Exergonic reactions do not require activation energy.

Correct AnswerverifiedShow Answer

When we shiver on a cold day,the heat produced by muscle tissue is a demonstration of

Correct AnswerverifiedC

The first law of thermodynamics states that once energy is consumed,it can no longer be converted to any other form of energy.

Correct AnswerverifiedFalse

The exchange of a phosphate group between creatine phosphate and adenosine diphosphate is categorized as a catabolic (rather than anabolic)reaction.

Correct AnswerverifiedShow Answer

Noncompetitive inhibition of an enzyme occurs when the inhibitor binds to the

Correct AnswerverifiedShow Answer

The intermediate stage of cellular respiration

Correct AnswerverifiedShow Answer

During the citric acid cycle,an acetyl CoA molecule produced in the intermediate stage combines with a molecule of

Correct AnswerverifiedA

Which enzyme class splits a chemical bond in the absence of water

Correct AnswerverifiedShow Answer

The energy stored in a molecule's chemical bonds is a form of kinetic energy.

Correct AnswerverifiedShow Answer

Glycolysis requires oxygen.

Correct AnswerverifiedShow Answer

The term "metabolism" refers to

Correct AnswerverifiedShow Answer

Generally,a decrease in substrate concentration leads to an increase in reaction rate.

Correct AnswerverifiedShow Answer

Fatty acids enter the cell respiration pathway at

Correct AnswerverifiedShow Answer

Organic cofactors are referred to as _________.

Correct AnswerverifiedShow Answer

Enzymes are biological catalysts that are crucial for normal human metabolism.

Correct AnswerverifiedShow Answer

A fever of 101 ∘\circ∘ F causes most enzymes in the human body

Correct AnswerverifiedShow Answer

A protein kinase is an enzyme that adds a phosphate to its substrate.

Correct AnswerverifiedShow Answer

When our inner ears convert sound energy into neural impulses or our retinas convert light into neural impulses,

Correct AnswerverifiedShow Answer

Which of the following choices lists the order of stages of cellular respiration in proper order

Correct AnswerverifiedShow Answer

The enzyme DNA polymerase is synthesized

Correct AnswerverifiedShow Answer

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False

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A fever of 101^$\circ$F causes most enzymes in the human body

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