Sem 3 BRS Micro - General Properties Of Microorganisms; /Bacteria

30 Questions | By Rosssweetie | Last updated: Mar 21, 2022 | Total Attempts: 192

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1.

A pharmaceutical company has developed a new compound that is well tolerated by the body and inhibits the sterol ergo sterol synthesis. Screening of anti-infectious agent activity should be directed toward
- A.
  
  Bacteria
- B.
  
  Chlamydia species
- C.
  
  Fungi
- D.
  
  Rickettsia species
- E.
  
  Viruses
2.

50S ribosomal subunits are found in
- A.
  
  Bacteria
- B.
  
  Fungi
- C.
  
  Prions
- D.
  
  Protozoa
- E.
  
  Viruses
3.

The normal flora of the large intestine consists mainly of
- A.
  
  Bacteria
- B.
  
  Fungi
- C.
  
  Protozoa
- D.
  
  Viruses
- E.
  
  No microbial agents
4.

The minimal concentration of alcohol necessary to kill bacteria and enveloped viruses is
- A.
  
  30%
- B.
  
  40%
- C.
  
  50%
- D.
  
  60%
- E.
  
  70%
5.

Human obligate intracellular pathogens that depend on the host cell for ATP production are
- A.
  
  Bacteriophages
- B.
  
  Mycoplasma species
- C.
  
  Prions
- D.
  
  Rickettsia species
- E.
  
  Viroids
6.

Dimorphism is a characteristic of
- A.
  
  Bacteria
- B.
  
  Fungi
- C.
  
  Prions
- D.
  
  Rickettsia species
- E.
  
  Viruses
7.

A new infectious agent has been isolated from deer ticks. It lacks a cell wall but has 70S ribosomes. This agent is most likely a
- A.
  
  Bacterium
- B.
  
  Chlamydia species
- C.
  
  Mycoplasma species
- D.
  
  Rickettsia species
- E.
  
  Virus
8.

Chapter 2 BACTERIA A bacterial toxin with super antigen activity is produced by
- A.
  
  Clostridia tetani
- B.
  
  Bordetella pertussis
- C.
  
  Escherichia coli
- D.
  
  Staphylococcus aureus
- E.
  
  Vibrio cholera
9.

Sugar transport into bacteria is frequently facilitated by
- A.
  
  Acetyl transferase
- B.
  
  Neuraminidases
- C.
  
  Oxidases
- D.
  
  Penicillin-binding proteins
- E.
  
  Phospho transferases
10.

Thayer-Martin and Martin-Lewis media are used to isolate and identify E. coli
- A.
  
  E. coli
- B.
  
  Mycobacteria
- C.
  
  Neisseria
- D.
  
  Salmonella
- E.
  
  Shigella
11.

B-lactamases confer antibiotic resistance by
- A.
  
  Altering antibiotic permeability
- B.
  
  Altering penicillin-binding proteins
- C.
  
  Altering 70S ribosome structure
- D.
  
  Modifying cellular RNA polymerase
- E.
  
  Modifying antibiotic structure
12.

Polymers of N-acetyl glucosamine and N-acetyl muramic acid are found in which of the following structures?
- A.
  
  Teichoic acid
- B.
  
  Cell wall
- C.
  
  Glycocalyx
- D.
  
  Lipopolysaccharide
13.

A phage that is not inactivated by proteases is called a
- A.
  
  Prophage
- B.
  
  Virulent phage
- C.
  
  Temperate phage
- D.
  
  Filamentous phage
14.

Bacteria that synthesize organic compounds from inorganic compounds are
- A.
  
  Heterotrophs
- B.
  
  Obligate anaerobes
- C.
  
  Aerobes
- D.
  
  Facultative anaerobes
- E.
  
  Autotrophs
15.

A bacterial structure involved in adherence is
- A.
  
  Capsule
- B.
  
  Lipopolysaccharide
- C.
  
  Ordinary pili
- D.
  
  O-specific side-chain
- E.
  
  Teichoic acid
16.

Aminoglycoside antibiotics are
- A.
  
  Bactericidal for Gram-positive bacteria
- B.
  
  Inactivated by R-factor phosphor transferases
- C.
  
  Mycolic acid synthesis inhibitors
- D.
  
  Peptidoglycan synthesis inhibitors
- E.
  
  Require bacterial growth for the effect
17.

A-B subunit structure as it relates to bacterial pathogenesis refers to the structure of
- A.
  
  Bacterial exotoxins
- B.
  
  Gram-negative bacteria endotoxin
- C.
  
  Nucleic acid inhibitor antibiotics
- D.
  
  Penicillin-binding proteins
- E.
  
  Resistance transfer factors
18.

Which of the following displays the Pasteur effect?
- A.
  
  Heterotrophs
- B.
  
  Obligate anaerobes
- C.
  
  Aerobes
- D.
  
  Facultative anaerobes
- E.
  
  Autotrophs
19.

Which of the following toxins acts on synaptosomes?
- A.
  
  E. coli heat-labile toxin
- B.
  
  Clostridium tetani exotoxin
- C.
  
  Corynebacterium diphtheria exotoxin
- D.
  
  Pseudomonas aeruginosa exotoxin
- E.
  
  Clostridium perfringens alpha-toxin
20.

Superoxide dismutase-containing bacteria
- A.
  
  Need superoxide to grow
- B.
  
  Are frequently obligate anaerobes
- C.
  
  Grow slowly in the presence of CO2
- D.
  
  Produce hydrogen peroxide from hydrogen ion and the superoxide free radical (O2-)
21.

Lysogenic phage conversion involves
- 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 chromosome
22.

Bacteria capable of growth in a high salt concentration are best isolated in which of the following media?
- A.
  
  Minimal growth media
- B.
  
  Complex growth media
- C.
  
  Differential growth media
- D.
  
  Selective growth media
23.

Bacteria lacking superoxide dismutase are
- A.
  
  Heterotrophs
- B.
  
  Obligate anaerobes
- C.
  
  Aerobes
- D.
  
  Facultative anaerobes
- E.
  
  Autotrophs
24.

The regulation of enzyme activity in bacterial cells can
- 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 molecules
25.

The plasma membrane
- A.
  
  Contains matrix porins
- B.
  
  Includes endotoxin
- C.
  
  Contains glycocalyx
- D.
  
  Contains the enzymes involved in bacterial oxidative phosphorylation