Question 1

Glycolysis and the Krebs cycle yield 10 molecules of NADH per molecule of glucose.How many molecules of ATP will be made from them in the electron transport system?

Accepted Answer

A)   10
B)   38
C)   36
D)   2
E)   30F) A) and B)
G) A) and D)

Question 2

Which of the following is not true of anaerobic respiration?

Accepted Answer

A)   It involves glycolysis.
B)   It generates some ATP.
C)   It utilizes an electron transport system.
D)   It uses the same final electron acceptor as aerobic respiration.E) C) and D)
F) B) and C)

Question 3

The unknown bacterium that you are testing makes the enzyme phenyalanine deaminase,as indicated by the results of a phenylalanine test.This enzyme facilitates the removal of a/an ______ group from the organic compound so it can be converted into an intermediate compound for the Krebs cycle.

Accepted Answer

A)   carboxyl
B)   amino
C)   phosphate
D)   hydroxylE) B) and C)
F) None of the above

Question 4

Each of the following are true of enzymes except

Accepted Answer

A)   they can be used over and over.
B)   they may or may not require cofactors.
C)   their active site is specific to the substrate.
D)   they increase the activation energy of a reaction.
E)   their action may involve minerals.F) A) and E)
G) A) and D)

Question 5

ATP is composed of deoxyribose,adenine,and three phosphate groups.

Accepted Answer

A) True 
 B)False

Question 6

The formation of citric acid from oxaloacetic acid and an acetyl group begins ______.

Accepted Answer

A)   glycolysis
B)   the electron transport system
C)   the Krebs cycle
D)   fermentation
E)   oxidative phosphorylationF) All of the above
G) C) and D)

Question 7

All of the following are exoenzymes except ______.

Accepted Answer

A)   ATP synthase
B)   streptokinase
C)   penicillinase
D)   collagenaseE) A) and C)
F) B) and C)

Question 8

Often the mnemonic device "OIL RIG" is used to remember the principles of redox reactions.Oxidation Is Loss and Reduction Is Gain of what?

Accepted Answer

A)   Electrons only
B)   Hydrogen only
C)   Oxygen only
D)   Electrons and hydrogen
E)   Oxygen and electronsF) C) and D)
G) A) and C)

Question 9

Enzymes that catalyze the removal of a a functional group and its subsequent attachment to a new substrate are called ______.

Accepted Answer

A)   transferases
B)   oxidoreductases
C)   isomerases
D)   lyases
E)   ligasesF) B) and D)
G) C) and D)

Question 10

Enzymes are

Accepted Answer

A)   broken down in reactions that require energy input.
B)   proteins that function as catalysts.
C)   used up in chemical reactions.
D)   not needed for catabolic reactions.
E)   carbohydrate or protein in composition.F) D) and E)
G) B) and D)

Question 11

One turn of the Calvin cycle fixes a molecule of CO2 gas and is driven by 3 molecules of ATP and 2 molecules of NADPH from the light reactions.Which of the following is true?

Accepted Answer

A)   It takes 3 turns of the cycle, 9 molecules of ATP, and 6 molecules of NADPH to make one molecule of glucose.
B)   It takes 6 turns of the cycle, 18 molecules of ATP, and 12 molecules of NADPH to make a glucose molecule.
C)   The cycle must be carried out in the dark.
D)   The cycle is exergonic.E) A) and C)
F) B) and C)

Question 12

Which of the following is not a process that regenerates ATP?

Accepted Answer

A)   Oxidative phosphorylation
B)   Reductive phosphorylation
C)   Substrate-level phosphorylation
D)   PhotophosphorylationE) A) and B)
F) A) and C)

Question 13

When the product of reaction A becomes the reactant of reaction B,this exemplifies a _______ metabolic pathway.

Accepted Answer

A)   linear
B)   bidirectional
C)   convergent
D)   cyclic
E)   divergentF) A) and B)
G) C) and D)

Question 14

The space between the cell membrane and the cell wall is important during aerobic respiration.Why?

Accepted Answer

A)   Hydrogen ions are transported out into the space to set up a hydrogen gradient.
B)   Cytochrome electron carriers are located in the space.
C)   Oxygen combines with electrons in that space to form water.
D)   Pyruvate is transported into the space to be converted into acetyl coenzyme A to enter the Krebs cycle.E) A) and B)
F) B) and C)

Question 15

The formation of peptide bonds between amino acids to build a polypeptide is an example of ______.

Accepted Answer

A)   anabolism
B)   phosphorylation
C)   fermentation
D)   catabolism
E)   glycolysisF) C) and E)
G) B) and C)

Question 16

Glycolysis uses 2 ATP and produces

Accepted Answer

A)   2 ATP only if oxygen is present.
B)   2 ATP without oxygen.
C)   4 ATP only if oxygen is present.
D)   4 ATP without oxygen.E) A) and D)
F) A) and C)

Question 17

The cell's metabolic reactions involve the participation of ______ that lower the activation energy needed for the initiation of a reaction.

Accepted Answer

A)   cofactors
B)   vitamins
C)   enzymes
D)   ATP
E)   coenzymesF) None of the above
G) A) and B)

Question 18

The reactions of fermentation function to produce _______ molecules for further use in glycolysis.

Accepted Answer

A)   pyruvic acid
B)   ATP
C)   NAD+
D)   NADH
E)   glucoseF) B) and D)
G) All of the above

Question 19

What chemical causes death in many eukaryotes because it blocks cytochrome C oxidase?

Accepted Answer

A)   Copper
B)   Iron
C)   Cyanide
D)   Oxygen
E)   Carbon monoxideF) B) and C)
G) C) and D)

Question 20

Which of the following statements is false regarding amphibolic pathways?

Accepted Answer

A)   Metabolic pathways are amphibolic, that is, catabolism and anabolism are intertwined in order to conserve energy in the cell.
B)   Glucose is broken down in glycolysis; however, not all of the intermediates in the pathway are utilized as an . energy source. Many leave the pathway to serve as precursors for complex molecules.
C)   Glyceraldehyde-3-phosphate is used as a precursor for amino acid, lipid, and carbohydrate synthesis.
D)   All organisms use metabolic pathways to synthesize the 20 amino acids necessary for protein synthesis using precursors from catabolic processes.
E)   Glucose is broken down during glycolysis to pyruvate; however, when glucose is in short supply, pyruvate is used as a precursor in the process of gluconeogenesis.F) A) and B)
G) A) and C)

Exam 8: Microbial Metabolism: The Chemical Crossroads of Life

The cell's metabolic reactions involve the participation of ______ that lower the activation energy needed for the initiation of a reaction.

Correct AnswerverifiedShow Answer

One turn of the Calvin cycle fixes a molecule of CO2 gas and is driven by 3 molecules of ATP and 2 molecules of NADPH from the light reactions.Which of the following is true?

Correct AnswerverifiedShow Answer

The unknown bacterium that you are testing makes the enzyme phenyalanine deaminase,as indicated by the results of a phenylalanine test.This enzyme facilitates the removal of a/an ______ group from the organic compound so it can be converted into an intermediate compound for the Krebs cycle.

Correct AnswerverifiedShow Answer

ATP is composed of deoxyribose,adenine,and three phosphate groups.

Correct AnswerverifiedShow Answer

The reactions of fermentation function to produce _______ molecules for further use in glycolysis.

Correct AnswerverifiedShow Answer

All of the following are exoenzymes except ______.

Correct AnswerverifiedShow Answer

The space between the cell membrane and the cell wall is important during aerobic respiration.Why?

Correct AnswerverifiedShow Answer

Often the mnemonic device "OIL RIG" is used to remember the principles of redox reactions.Oxidation Is Loss and Reduction Is Gain of what?

Correct AnswerverifiedShow Answer

Glycolysis uses 2 ATP and produces

Correct AnswerverifiedShow Answer

Each of the following are true of enzymes except

Correct AnswerverifiedShow Answer

Enzymes that catalyze the removal of a a functional group and its subsequent attachment to a new substrate are called ______.

Correct AnswerverifiedShow Answer

Glycolysis and the Krebs cycle yield 10 molecules of NADH per molecule of glucose.How many molecules of ATP will be made from them in the electron transport system?

Correct AnswerverifiedShow Answer

Enzymes are

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The formation of citric acid from oxaloacetic acid and an acetyl group begins ______.

Correct AnswerverifiedShow Answer

Which of the following is not true of anaerobic respiration?

Correct AnswerverifiedShow Answer

What chemical causes death in many eukaryotes because it blocks cytochrome C oxidase?

Correct AnswerverifiedShow Answer

Which of the following statements is false regarding amphibolic pathways?

Correct AnswerverifiedShow Answer

The formation of peptide bonds between amino acids to build a polypeptide is an example of ______.

Correct AnswerverifiedShow Answer

When the product of reaction A becomes the reactant of reaction B,this exemplifies a _______ metabolic pathway.

Correct AnswerverifiedShow Answer

Which of the following is not a process that regenerates ATP?

Correct AnswerverifiedShow Answer

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One turn of the Calvin cycle fixes a molecule of CO₂ gas and is driven by 3 molecules of ATP and 2 molecules of NADPH from the light reactions.Which of the following is true?

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