Question 1

The organism is found to grow throughout the entire tube of broth media. Which of the following terms best describes the oxygen requirement of this organism?

Accepted Answer

A)   Obligate aerobe
B)   Microaerophile
C)   Facultative anaerobe
D)   Obligate anaerobeE) C) and D)
F) None of the above

Question 2

Which of the following statements, by the patient's mother, best represents an understanding of metabolism?

Accepted Answer

A)   Metabolism involves the production of enzymes.
B)   Metabolism involves all chemical reactions and physical workings of the cell.
C)   Metabolism involves the consumption of energy for workings of the cell.
D)   Metabolism involves the production of energy for workings of the cell.E) None of the above
F) C) and D)

Question 3

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) None of the above
G) A) and B)

Question 4

The breakdown of peptidoglycan to N-acetylmuramic acid, N-acetylglucosamine, and peptides is an example of ________.

Accepted Answer

A)   anabolism
B)   catabolism
C)   phosphorylation
D)   fermentation
E)   synthesisF) B) and D)
G) None of the above

Question 5

In aerobic respiration, the majority of the reduced coenzyme NADH is produced in ________.

Accepted Answer

A)   glycolysis
B)   the Krebs cycle
C)   the electron transport chain
D)   photosynthesis
E)   the cell membraneF) D) and E)
G) A) and D)

Question 6

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)   endoenzymesF) B) and D)
G) C) and D)

Question 7

Reactants are converted to products by ________.

Accepted Answer

A)   enzymes releasing energy
B)   breaking and forming bonds
C)   enzymes binding to reactants
D)   reactants releasing energy
E)   None of the choices are correctF) C) and D)
G) C) and E)

Question 8

Feedback inhibition, a negative feedback mechanism that regulates enzymes, 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)   None of the choices are correct.F) D) and E)
G) A) and E)

Question 9

In bacterial cells, the electron transport system is located in the ________.

Accepted Answer

A)   cell membrane
B)   mitochondria
C)   chloroplasts
D)   ribosomes
E)   cytoplasmF) A) and E)
G) A) and C)

Question 10

The RN educates the patient and her family about cellular metabolism. Which of the following processes is common to fermentation, anaerobic respiration, and aerobic respiration?

Accepted Answer

A)   Glycolysis
B)   The Krebs cycle
C)   The electron transport system
D)   GlycosylationE) B) and D)
F) A) and B)

Question 11

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

Accepted Answer

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

Question 12

The formation of citrate from oxaloacetate and an acetyl-CoA begins ________.

Accepted Answer

A)   glycolysis
B)   the electron transport system
C)   the Krebs cycle
D)   fermentation
E)   oxidative phosphorylationF) None of the above
G) A) and E)

Question 13

Enzymes that hydrolyze a peptide bond are called ________.

Accepted Answer

A)   phosphotransferases
B)   oxidoreductases
C)   peptidases
D)   aminotransferases
E)   ligasesF) B) and C)
G) All of the above

Question 14

When enzyme action stops due to a buildup of end product, this control is called ________.

Accepted Answer

A)   feedback inhibition (negative feedback) 
B)   competitive inhibition
C)   enzyme induction
D)   enzyme repression
E)   None of the choices are correct.F) A) and B)
G) A) and E)

Question 15

An example of amphibolism is when ________.

Accepted Answer

A)   pyruvate is converted to acetyl CoA to enter the Krebs cycle, and is also used as a precursor for amino acid production
B)   acetyl CoA enters the Krebs cycle, and is also used for fatty acid production
C)   intermediates of glucose oxidation are further oxidized during glycolysis, and are also harnessed for the production of complex carbohydrates
D)   All of the above are examples of amphibolismE) A) and D)
F) A) and C)

Question 16

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 the choices are correctF) None of the above
G) D) and E)

Question 17

Which of the following does not reflect anabolism?

Accepted Answer

A)   Beta oxidation of fatty acids to acetyl CoA.
B)   Enzyme production from amino acids.
C)   DNA replication from nucleotides.
D)   Fatty acid assimilation to form lipids.E) B) and C)
F) A) and C)

Question 18

ATP molecules are catalysts that lower the activation energy needed to initiate a reaction.

Accepted Answer

A) True 
 B)False

Question 19

Important components of coenzymes are ________.

Accepted Answer

A)   vitamins
B)   metallic ions
C)   active sites
D)   substrates
E)   ribozymesF) C) and D)
G) A) and E)

Question 20

The complete combustion of methane is written CH4 + 2O2 → CO2 + 2H2O. In this reaction, the methane is ________ and the oxygen is ________.

Accepted Answer

A)   oxidized; reduced
B)   reduced; oxidized
C)   phosphorylated; oxidized
D)   endergonic; exergonicE) A) and B)
F) A) and C)

Exam 7: Microbial Metabolism

Enzymes are ________.

Correct AnswerverifiedShow Answer

The complete combustion of methane is written CH4 + 2O2 → CO2 + 2H2O. In this reaction, the methane is ________ and the oxygen is ________.

Correct AnswerverifiedShow Answer

The breakdown of peptidoglycan to N-acetylmuramic acid, N-acetylglucosamine, and peptides is an example of ________.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

An example of amphibolism is when ________.

Correct AnswerverifiedShow Answer

Which of the following does not reflect anabolism?

Correct AnswerverifiedShow Answer

The formation of citrate from oxaloacetate and an acetyl-CoA begins ________.

Correct AnswerverifiedShow Answer

Enzymes that hydrolyze a peptide bond are called ________.

Correct AnswerverifiedShow Answer

Feedback inhibition, a negative feedback mechanism that regulates enzymes, is best described as ________.

Correct AnswerverifiedShow Answer

In aerobic respiration, the majority of the reduced coenzyme NADH is produced in ________.

Correct AnswerverifiedShow Answer

The organism is found to grow throughout the entire tube of broth media. Which of the following terms best describes the oxygen requirement of this organism?

Correct AnswerverifiedShow Answer

Reactants are converted to products by ________.

Correct AnswerverifiedShow Answer

The RN educates the patient and her family about cellular metabolism. Which of the following processes is common to fermentation, anaerobic respiration, and aerobic respiration?

Correct AnswerverifiedShow Answer

Which of the following statements, by the patient's mother, best represents an understanding of metabolism?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

An apoenzyme is ________.

Correct AnswerverifiedShow Answer

When enzyme action stops due to a buildup of end product, this control is called ________.

Correct AnswerverifiedShow Answer

Important components of coenzymes are ________.

Correct AnswerverifiedShow Answer

In bacterial cells, the electron transport system is located in the ________.

Correct AnswerverifiedShow Answer

ATP molecules are catalysts that lower the activation energy needed to initiate a reaction.

Correct AnswerverifiedShow Answer

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The complete combustion of methane is written CH₄ + 2O₂ → CO₂ + 2H₂O. In this reaction, the methane is and the oxygen is .

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