Question 1

Ribozymes are

Accepted Answer

A)   ribosomes which catalyze reactions.
B)   unique to prokaryotes.
C)   unique to eukaryotes.
D)   catalysts for RNA editing.
E)   catalysts for DNA splicing.F) A) and D)
G) D) and E)

Question 2

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) D) and E)
G) None of the above

Question 3

All of the following pertain to glycolysis EXCEPT

Accepted Answer

A)   occurs without oxygen.
B)   ends with formation of pyruvic acid.
C)   occurs during fermentation.
D)   degrades glucose to CO2 and H2O.
E)   involves reduction of NAD.F) B) and C)
G) D) and E)

Question 4

Important components of coenzymes are

Accepted Answer

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

Question 5

In most instances, anabolic pathways are nearly the exact reverse of catbolic pathways.

Accepted Answer

A) True 
 B)False

Question 6

Fermentation

Accepted Answer

A)   requires an organic electron acceptor.
B)   requires oxygen.
C)   only occurs in aerobic organisms.
D)   is equivalent to aerobic respiration in ATP production.E) C) and D)
F) B) and C)

Question 7

Denaturing an apoenzyme will destroy the three-dimensional shape of the protein, making it nonfunctional.

Accepted Answer

A) True 
 B)False

Question 8

The process in which organisms integrate catabolic and anabolic pathways to improve cell efficiency is called

Accepted Answer

A)   metabolism.
B)   amphibolism.
C)   anabolism.
D)   catabolism.
E)   biosynthesis.F) A) and E)
G) A) and D)

Question 9

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) C) and E)
G) C) and D)

Question 10

The best way to control a metabolic pathway is to control the fastest enzyme in the series.

Accepted Answer

A) True 
 B)False

Question 11

The reactions of fermentation function to regenerate _____ molecules for use in glycolysis.

Accepted Answer

A)   pyruvic acid
B)   ATP
C)   NAD
D)   NADH
E)   glucoseF) C) and D)
G) A) and B)

Question 12

All of the following occur during the light-independent reactions EXCEPT

Accepted Answer

A)   carbon fixation.
B)   reduction of intermediates by NADPH.
C)   phosphorylation of ADP to form ATP.
D)   regeneration or RuBP.E) A) and C)
F) B) and C)

Question 13

Enzymes that are always present, regardless of the amount of substrate are

Accepted Answer

A)   apoenzymes.
B)   axoenzymes.
C)   constitutive enzymes.
D)   regulated enzymes.
E)   endoenzymes.F) A) and D)
G) All of the above

Question 14

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)   All of these choices are correct.F) All of the above
G) None of the above

Question 15

Mixed acid fermentation

Accepted Answer

A)   produces butyric acid.
B)   occurs in all bacteria.
C)   produces several different acids plus CO2 and H2 gases.
D)   is seen in Streptococcus and Lactobacillus.
E)   also produces ethanol.F) A) and B)
G) A) and C)

Question 16

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) All of the above
G) A) and B)

Question 17

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) B) and C)

Question 18

How many carbon dioxide molecules are produced by the complete aerobic breakdown of one glucose molecule?

Accepted Answer

A)   2
B)   3
C)   4
D)   5
E)   6F) A) and D)
G) B) and C)

Question 19

Amination is the addition of an)  _____ group to a carbon skeleton.

Accepted Answer

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

Question 20

Feedback inhibition is best described as

Accepted Answer

A)   substrate binding to DNA, blocking enzyme transcription.
B)   product binding to DNA, blocking enzyme transcription.
C)   substrate binding to enzyme in noncompetitive site.
D)   product binding to enzyme in noncompetitive site.E) A) and C)
F) C) and D)

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

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

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All of the following occur during the light-independent reactions EXCEPT

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The best way to control a metabolic pathway is to control the fastest enzyme in the series.

Correct AnswerverifiedShow Answer

The reactions of fermentation function to regenerate _____ molecules for use in glycolysis.

Correct AnswerverifiedShow Answer

Important components of coenzymes are

Correct AnswerverifiedShow Answer

The process in which organisms integrate catabolic and anabolic pathways to improve cell efficiency is called

Correct AnswerverifiedShow Answer

How many carbon dioxide molecules are produced by the complete aerobic breakdown of one glucose molecule?

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All of the following pertain to glycolysis EXCEPT

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Ribozymes are

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Enzymes that are always present, regardless of the amount of substrate are

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Enzymes are

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In most instances, anabolic pathways are nearly the exact reverse of catbolic pathways.

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Mixed acid fermentation

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

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Fermentation

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

Correct AnswerverifiedShow Answer

Amination is the addition of an) _____ group to a carbon skeleton.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Denaturing an apoenzyme will destroy the three-dimensional shape of the protein, making it nonfunctional.

Correct AnswerverifiedShow Answer

Feedback inhibition is best described as

Correct AnswerverifiedShow Answer

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