Question 1

Microbes can utilize only carbohydrates for energy production.

Accepted Answer

A) True 
 B)False

Question 2

Below is a metabolic pathway having 3 chemical reactions and 3 enzymes.Enzyme 1 has 2 binding sites-- 1 for the substrate A and another for the end productAs the pathway proceeds,the end product in higher quantities will react with enzyme 1,blocking the enzyme's binding to the substrate.Which statement is true about this pathway?
Enz1 enz2 enz3
Substrate A --> B --> C --> D end product

Accepted Answer

A)  This is a case of noncompetitive inhibition.
B)  As a result of the inhibition of the enzyme,there will eventually be less substrate converted to the end product D.
C)  Enzyme 1 has an active site and a regulatory site.
D)  All of the choices are correct.E) None of the above
F) A) and D)

Question 3

Ribozymes are ______.

Accepted Answer

A)   ribosomes which catalyze reactions
B)   unique to prokaryotes
C)   unique to eukaryotes
D)   catalysts for RNA splicing
E)   catalysts for DNA splicingF) All of the above
G) A) and E)

Question 4

When enzyme action stops due to a buildup of end product that acts as a regulatory molecule,this control is called ______.

Accepted Answer

A)   competitive inhibition
B)   enzyme induction
C)   enzyme repression
D)   noncompetitive inhibitionE) A) and B)
F) B) and C)

Question 5

ATP synthase is a complex enzyme needed for oxidative phosphorylation.

Accepted Answer

A) True 
 B)False

Question 6

A bacterium that you isolated from pond water appears to use light for energy.Based upon this information,you inoculate the organism into fresh media,infused with lots of carbon dioxide.Even after incubation at the correct temperature (of pond water) ,the organism is not growing.Your best explanation of what might have happened is

Accepted Answer

A)   there was no sulfur compound added to the medium, that could be used as an electron donor.
B)   no oxygen was added to the medium so the organism died.
C)   there is some inhibitory chemical that is preventing the growth of the bacterium.
D)   you were using the wrong type of sunlight as the energy source for the bacterium.E) A) and D)
F) None of the above

Question 7

In which stage of aerobic respiration is water produced?

Accepted Answer

A)   Glycolysis
B)   The Krebs cycle
C)   The electron transport systemD) A) and B)
E) A) and C)

Question 8

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

Accepted Answer

A) True 
 B)False

Question 9

Noncompetitive inhibition is best described as

Accepted Answer

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

Question 10

An apoenzyme is ______.

Accepted Answer

A)   part of a simple enzyme
B)   also called a coenzyme
C)   the protein part of a holoenzyme
D)   often an inorganic metal ion
E)   an RNA moleculeF) A) and B)
G) A) and C)

Question 11

Enzymes that catalyze the removal of electrons from one substrate and the addition of electrons to another are called ______.

Accepted Answer

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

Question 12

Each FADH2 from the Krebs cycle that enters the electron transport system results in the production of _____ ATP(s) .

Accepted Answer

A)   1
B)   2
C)   3
D)   4
E)   5F) A) and B)
G) C) and E)

Question 13

During aerobic cellular respiration,the final electron acceptor is ______.

Accepted Answer

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

Question 14

All of the following pertain to glycolysis except

Accepted Answer

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

Question 15

The principle sites of amphibolic interaction occur during ______.

Accepted Answer

A)   glycolysis and photosynthesis
B)   the Krebs cycle and the electron transport system
C)   glycolysis and the Krebs cycle
D)   fermentation and the Krebs cycle
E)   fermentation and glycolysisF) A) and B)
G) B) and D)

Question 16

Building block molecules for biosynthetic pathways come from the cell's catabolic pathways and from the environment.

Accepted Answer

A) True 
 B)False

Question 17

Which of the following processes is endergonic?

Accepted Answer

A)   Beta oxidation of fatty acids
B)   Carbon fixation
C)   The oxidation of glucose
D)   Deamination
E)   Burning woodF) B) and C)
G) A) and D)

Question 18

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

Accepted Answer

A) True 
 B)False

Question 19

Reactants are converted to products by

Accepted Answer

A)   enzymes releasing energy.
B)   breaking and forming bonds.
C)   enzymes binding to products.
D)   reactants always releasing energy.E) All of the above
F) None of the above

Question 20

Cells generate ATP from the release of chemical energy from nutrients,whereas chlorophyll-containing organisms generate ATP via the light-dependent reactions of photosynthesis as well as from the oxidation of nutrients.

Accepted Answer

A) True 
 B)False

Exam 8: Microbial Metabolism: The Chemical Crossroads of Life

The principle sites of amphibolic interaction occur during ______.

Correct Answer
verified

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

Correct Answer
verified

ATP synthase is a complex enzyme needed for oxidative phosphorylation.

Correct Answer
verified

Each FADH₂ from the Krebs cycle that enters the electron transport system results in the production of _____ ATP(s) .

Correct Answer
verified

Cells generate ATP from the release of chemical energy from nutrients,whereas chlorophyll-containing organisms generate ATP via the light-dependent reactions of photosynthesis as well as from the oxidation of nutrients.

Correct Answer
verified

Reactants are converted to products by

Correct Answer
verified

During aerobic cellular respiration,the final electron acceptor is ______.

Correct Answer
verified

Building block molecules for biosynthetic pathways come from the cell's catabolic pathways and from the environment.

Correct Answer
verified

Correct Answer
verified

Microbes can utilize only carbohydrates for energy production.

Correct Answer
verified

Which of the following processes is endergonic?

Correct Answer
verified

Enzymes that catalyze the removal of electrons from one substrate and the addition of electrons to another are called ______.

Correct Answer
verified

Ribozymes are ______.

Correct Answer
verified

All of the following pertain to glycolysis except

Correct Answer
verified

In which stage of aerobic respiration is water produced?

Correct Answer
verified

Noncompetitive inhibition is best described as

Correct Answer
verified

Correct Answer
verified

When enzyme action stops due to a buildup of end product that acts as a regulatory molecule,this control is called ______.

Correct Answer
verified

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

Correct Answer
verified

An apoenzyme is ______.

Correct Answer
verified

Exam 8: Microbial Metabolism: The Chemical Crossroads of Life

The principle sites of amphibolic interaction occur during ______.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

ATP synthase is a complex enzyme needed for oxidative phosphorylation.

Correct AnswerverifiedShow Answer

Each FADH2 from the Krebs cycle that enters the electron transport system results in the production of _____ ATP(s) .

Correct AnswerverifiedShow Answer

Cells generate ATP from the release of chemical energy from nutrients,whereas chlorophyll-containing organisms generate ATP via the light-dependent reactions of photosynthesis as well as from the oxidation of nutrients.

Correct AnswerverifiedShow Answer

Reactants are converted to products by

Correct AnswerverifiedShow Answer

During aerobic cellular respiration,the final electron acceptor is ______.

Correct AnswerverifiedShow Answer

Building block molecules for biosynthetic pathways come from the cell's catabolic pathways and from the environment.

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Microbes can utilize only carbohydrates for energy production.

Correct AnswerverifiedShow Answer

Which of the following processes is endergonic?

Correct AnswerverifiedShow Answer

Enzymes that catalyze the removal of electrons from one substrate and the addition of electrons to another are called ______.

Correct AnswerverifiedShow Answer

Ribozymes are ______.

Correct AnswerverifiedShow Answer

All of the following pertain to glycolysis except

Correct AnswerverifiedShow Answer

In which stage of aerobic respiration is water produced?

Correct AnswerverifiedShow Answer

Noncompetitive inhibition is best described as

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

When enzyme action stops due to a buildup of end product that acts as a regulatory molecule,this control is called ______.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

An apoenzyme is ______.

Correct AnswerverifiedShow Answer

Correct Answer
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Correct Answer
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Correct Answer
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Each FADH₂ from the Krebs cycle that enters the electron transport system results in the production of _____ ATP(s) .

Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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