Question 1

The regulation of enzyme activity in bacterial cells can

Accepted Answer

A)   Be coupled to the binding of effector molecules
B)   Be controlled by a catabolite activator protein (CAP) 
C)   Occur via attenuation sequences
D)   Involve inducer moleculesE) C) and D)
F) All of the above

Question 2

Bacteria capable of growth in a high salt concentration are best isolated in which of the following media?

Accepted Answer

A)   Minimal growth media
B)   Complex growth media
C)   Differential growth media
D)   Selective growth mediaE) B) and C)
F) A) and B)

Question 3

A bacterial toxin with superantigen activity is produced by

Accepted Answer

A)   Clostridium tetani
B)   Bordetella pertussis
C)   Escherichia coli
D)   Staphylococcus aureus
E)   Vibrio choleraeF) A) and C)
G) B) and C)

Question 4

The plasma membrane

Accepted Answer

A)   Contains matrix porins
B)   Includes endotoxin
C)   Contains glycocalyx
D)   Contains the enzymes involved in bacterial oxidative phosphorylationE) B) and D)
F) None of the above

Question 5

Which of the following processes creates high-frequency recombination donors?

Accepted Answer

A)   Transformation
B)   Conjugation
C)   Transduction
D)   Transcription
E)   RecombinationF)  TranslationG) A) and C)
H) D) and F)

Question 6

A mutation which rarely disrupts gene product function is a

Accepted Answer

A)   Deletion
B)   Frameshift
C)   Insertion
D)   Nonsense
E)   Nucleotide substitutionF) A) and B)
G) A) and E)

Question 7

Lysogenic phage conversion involves

Accepted Answer

A)   The transformation of a virulent phage to a lysogenic phage
B)   A change in bacterial phenotype due to the presence of a prophage
C)   The conversion of a prophage to a temperate phage
D)   The incorporation of a prophage into the bacterial chromosomeE) C) and D)
F) B) and C) B

Question 8

The expression of the lac operon

Accepted Answer

A)   Must be initiated by the binding of an inducer protein
B)   Involves the release of allolactose from a repressor protein
C)   Does not involve the expression of structural genes
D)   Necessitates the finding of RNA polymerase followed by transcriptionE) B) and D)
F) A) and B)

Question 9

A-B subunit structure as it relates to bacterial pathogenesis refers to the structure of

Accepted Answer

A)   Bacterial exotoxins
B)   Gram-negative bacteria endotoxin
C)   Nucleic acid inhibitor antibiotics
D)   Penicillin-binding proteins
E)   Resistance transfer factorsF) A) and B)
G) C) and D)

Question 10

Toxins of enterotoxic Gram-negative bacteria are transferred outside of the cell by

Accepted Answer

A)   ATP-activated pores
B)   GTP-coupled transporters
C)   PBPs
D)   Pili
E)   Protein secretion systemsF) A) and B)
G) All of the above

Question 11

β−\beta-β− lactamases confer antibiotic resistance by

Accepted Answer

A)   Altering antibiotic permeability
B)   Altering penicillin-binding proteins
C)   Altering 70S ribosome structure
D)   Modifying cellular RNA polymerase
E)   Modifying antibiotic structure F) B) and E)
G) None of the above

Question 12

Bacteriophage containing host-cell DNA is involved in which of the following processes?

Accepted Answer

A)   Transformation
B)   Conjugation
C)   Transduction
D)   Transcription
E)   RecombinationF) A) and E)
G) A) and D)

Question 13

A phage that is not inactivated by proteases is called a

Accepted Answer

A)   Prophage
B)   Virulent phage
C)   Temperate phage
D)   Filamentous phageE) All of the above
F) A) and B)

Question 14

A bacterial structure involved in adherence is

Accepted Answer

A)   Capsule
B)   Lipopolysaccharide
C)   Common pili
D)   O-specific side chain
E)   Teichoic acidF) D) and E)
G) B) and D)

Question 15

Sugar transport into bacteria is frequently facilitated by

Accepted Answer

A)   Acetyltransferase
B)   Neuraminidases
C)   Oxidases
D)   Penicillin-binding proteins
E)   PhosphotransferasesF) A) and B)
G) A) and E)

Question 16

Which of the following toxins acts on synaptosomes?

Accepted Answer

A)   E. coli heat-labile toxin
B)   Clostridium tetani exotoxin
C)   Corynebacterium diphtheriae exotoxin
D)   Pseudomonas aeruginosa exotoxin
E)   Clostridium perfringens alpha-toxinF) A) and C)
G) C) and D) B

Question 17

Bacteria lacking superoxide dismutase are

Accepted Answer

A)   Heterotrophs
B)   Obligate anaerobes
C)   Aerobes
D)   Facultative anaerobes
E)   AutotrophsF) A) and C)
G) B) and D)

Question 18

Superoxide dismutase-containing bacteria

Accepted Answer

A)   Need superoxide to grow
B)   Are frequently obligate anaerobes
C)   Grow slowly in the presence of  CO2CO_2CO2​ 
D)   Produce hydrogen peroxide from hydrogen ion and the superoxide free radical  (O2⋅−) ({O_2}^{\cdot-}) (O2​⋅−) E) A) and D)
F) B) and C) D

Question 19

Aminoglycoside antibiotics are

Accepted Answer

A)   Bactericidal for Gram-positive bacteria
B)   Inactivated by R-factor phosphotransferases
C)   Mycolic acid synthesis inhibitors
D)   Peptidoglycan synthesis inhibitors
E)   Items that require bacterial growth for the effectF) C) and D)
G) None of the above

Question 20

Which of the following displays the Pasteur effect?

Accepted Answer

A)   Heterotrophs
B)   Obligate anaerobes
C)   Aerobes
D)   Facultative anaerobes
E)   AutotrophsF) B) and D)
G) B) and C)

Exam 2: Bacteria

The regulation of enzyme activity in bacterial cells can

Correct AnswerverifiedShow Answer

Bacteria capable of growth in a high salt concentration are best isolated in which of the following media?

Correct AnswerverifiedShow Answer

A bacterial toxin with superantigen activity is produced by

Correct AnswerverifiedShow Answer

The plasma membrane

Correct AnswerverifiedShow Answer

Which of the following processes creates high-frequency recombination donors?

Correct AnswerverifiedShow Answer

A mutation which rarely disrupts gene product function is a

Correct AnswerverifiedShow Answer

Lysogenic phage conversion involves

Correct AnswerverifiedB

The expression of the lac operon

Correct AnswerverifiedShow Answer

A-B subunit structure as it relates to bacterial pathogenesis refers to the structure of

Correct AnswerverifiedShow Answer

Toxins of enterotoxic Gram-negative bacteria are transferred outside of the cell by

Correct AnswerverifiedShow Answer

β−\beta-β− lactamases confer antibiotic resistance by

Correct AnswerverifiedShow Answer

Bacteriophage containing host-cell DNA is involved in which of the following processes?

Correct AnswerverifiedShow Answer

A phage that is not inactivated by proteases is called a

Correct AnswerverifiedShow Answer

A bacterial structure involved in adherence is

Correct AnswerverifiedShow Answer

Sugar transport into bacteria is frequently facilitated by

Correct AnswerverifiedShow Answer

Which of the following toxins acts on synaptosomes?

Correct AnswerverifiedB

Bacteria lacking superoxide dismutase are

Correct AnswerverifiedShow Answer

Superoxide dismutase-containing bacteria

Correct AnswerverifiedD

Aminoglycoside antibiotics are

Correct AnswerverifiedShow Answer

Which of the following displays the Pasteur effect?

Correct AnswerverifiedShow Answer

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B

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$\beta-$ lactamases confer antibiotic resistance by

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B

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D

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