Question 1

When the product of reaction A becomes the reactant of reaction B, the metabolic pathway is

Accepted Answer

A)  linear.
B)  bidirectional.
C)  convergent.
D)  cyclic.
E)  divergent.F) A) and D)
G) A) and C)

Question 2

All organisms that are photosynthetic are oxygenic.

Accepted Answer

A) True 
 B)False

Question 3

Each NADH that enters the electron transport system gives rise to _____ ATP.

Accepted Answer

A)  2
B)  3
C)  24
D)  36
E)  38F) B) and C)
G) B) and D)

Question 4

Intermediates from the Krebs cycle can be converted to amino acids by the process of

Accepted Answer

A)  amination.
B)  deamination.
C)  phosphorylation.
D)  beta oxidation.
E)  gluconeogenesis.F) C) and D)
G) A) and D)

Question 5

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 D)
F) C) and D)

Question 6

What is the final electron acceptor during aerobic respiration?

Accepted Answer

A)  pyruvic acid
B)  oxygen
C)  nitrate
D)  Cytochrome c
E)  FADF) D) and E)
G) A) and C) B

Question 7

ATP is composed of deoxyribose, adenine, and 3 phosphate groups.

Accepted Answer

A) True 
 B)False

Question 8

Which of these enzymes is NOT an exoenzyme?

Accepted Answer

A)  ATP synthase
B)  streptokinase
C)  penicillinase
D)  collagenase
E)  elastaseF) B) and D)
G) A) and B)

Question 9

In the cell, energy released by electrons is often used to phosphorylate

Accepted Answer

A)  ATP.
B)  ADP.
C)  pyruvic acid.
D)  oxygen.
E)  NAD.F) All of the above
G) A) and C)

Question 10

Important components of coenzymes are

Accepted Answer

A)  vitamins.
B)  metallic ions.
C)  active sites.
D)  substrates.
E)  ribozymes.F) D) and E)
G) A) and B)

Question 11

Which form of energy fuels cellular energetics in chemoheterotrophs?

Accepted Answer

A)  light energy from the Sun
B)  chemical energy in organic compounds
C)  electrical energy
D)  thermal energyE) A) and D)
F) All of the above

Question 12

Enzymes that catalyze removal of carbon dioxide from a substrate are called

Accepted Answer

A)  phosphotransferases.
B)  oxidoreductases.
C)  decarboxylases.
D)  aminotransferases.
E)  ligases.F) All of the above
G) B) and C)

Question 13

Enzymes that catalyze moving a phosphate from one substrate to another are called

Accepted Answer

A)  phosphotransferases.
B)  oxidoreductases.
C)  decarboxylases.
D)  aminotransferases.
E)  ligases.F) A) and D)
G) All of the above A

Question 14

A holoenzyme is a combination of a protein and one or more substances called

Accepted Answer

A)  substrates.
B)  apoenzymes.
C)  catalysts.
D)  cofactors.E) All of the above
F) A) and B)

Question 15

The redox carriers of the electron transport chain that have a tightly bound metal atom responsible for accepting and donating electrons are

Accepted Answer

A)  NAD molecules.
B)  FAD molecules.
C)  NADP molecules.
D)  the cytochromes.
E)  the flavoproteins.F) B) and C)
G) B) and D)

Question 16

When glucose is broken down by glycolysis during bacterial fermentation, what is the net production of ATP?

Accepted Answer

A)  2 ATP
B)  3 ATP
C)  24 ATP
D)  36 ATP
E)  38 ATPF) A) and E)
G) B) and D)

Question 17

The most likely place where an exoenzyme participates in a chemical reaction is

Accepted Answer

A)  mitochondria.
B)  within the cell membrane.
C)  lysosomes.
D)  cytoplasm.
E)  outside of the cell.F) All of the above
G) None of the above E

Question 18

Enzymes that are secreted by a cell to catalyze hydrolysis reactions are

Accepted Answer

A)  apoenzymes.
B)  exoenzymes.
C)  constitutive enzymes.
D)  regulated enzymes.
E)  endoenzymes.F) A) and B)
G) B) and C)

Question 19

An apoenzyme

Accepted Answer

A)  is part of a simple enzyme.
B)  is also called a coenzyme.
C)  is the protein part of a holoenzyme.
D)  is often an inorganic metal ion.
E)  is an RNA molecule.F) All of the above
G) A) and E)

Question 20

Which of the following would produce the most ATP?

Accepted Answer

A)  E.coli growing in a sealed glucose broth for 48 hours
B)  E.coli growing in a well-aerated glucose broth for 48 hours
C)  Both cultures would produce the same amount of ATP.
D)  This prediction cannot be made from the information provided.E) None of the above
F) B) and D)

Exam 8: An Introduction to Microbial Metabolism: the Chemical Crossroads of Life

When the product of reaction A becomes the reactant of reaction B, the metabolic pathway is

Correct AnswerverifiedShow Answer

All organisms that are photosynthetic are oxygenic.

Correct AnswerverifiedShow Answer

Each NADH that enters the electron transport system gives rise to _____ ATP.

Correct AnswerverifiedShow Answer

Intermediates from the Krebs cycle can be converted to amino acids by the process of

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

What is the final electron acceptor during aerobic respiration?

Correct AnswerverifiedB

ATP is composed of deoxyribose, adenine, and 3 phosphate groups.

Correct AnswerverifiedShow Answer

Which of these enzymes is NOT an exoenzyme?

Correct AnswerverifiedShow Answer

In the cell, energy released by electrons is often used to phosphorylate

Correct AnswerverifiedShow Answer

Important components of coenzymes are

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Which form of energy fuels cellular energetics in chemoheterotrophs?

Correct AnswerverifiedShow Answer

Enzymes that catalyze removal of carbon dioxide from a substrate are called

Correct AnswerverifiedShow Answer

Enzymes that catalyze moving a phosphate from one substrate to another are called

Correct AnswerverifiedA

A holoenzyme is a combination of a protein and one or more substances called

Correct AnswerverifiedShow Answer

The redox carriers of the electron transport chain that have a tightly bound metal atom responsible for accepting and donating electrons are

Correct AnswerverifiedShow Answer

When glucose is broken down by glycolysis during bacterial fermentation, what is the net production of ATP?

Correct AnswerverifiedShow Answer

The most likely place where an exoenzyme participates in a chemical reaction is

Correct AnswerverifiedE

Enzymes that are secreted by a cell to catalyze hydrolysis reactions are

Correct AnswerverifiedShow Answer

An apoenzyme

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Which of the following would produce the most ATP?

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B

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A

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E

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