Deck 1: General Properties of Microorganisms

Question 1

A pharmaceutical company has developed a new compound that is well tolerated by the body and inhibits the sterol ergosterol synthesis. Screening of anti-infectious agent activity should be directed toward

A) Bacteria
B)Chlamydia species
C)Fungi
D)Rickettsia species
E)Viruses

Answer 1

Fungi

Question 2

50S ribosomal subunits are found in

A) Bacteria
B)Fungi
C)Prions
D)Protozoa
E)Viruses

Answer 2

Bacteria

Question 3

The normal flora of the large intestine consists mainly of

A) Bacteria
B)Fungi
C)Protozoa
D)Viruses
E)No microbial agents

Answer 3

Bacteria

Question 4

The minimal concentration of alcohol necessary to kill bacteria and enveloped viruses is

A) 30%
B)40%
C)50%
D)60%
E)70%

Question 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

Question 6

Dimorphism is a characteristic of

A) Bacteria
B)Fungi
C)Prions
D)Rickettsia species
E)Viruses

Question 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

Question 8

The infectious agent associated with Creutzfeldt-Jakob disease is extremely hardy, but can be inactivated by

A) Catalases
B)Hyaluronidases
C)Nucleases
D)Phospholipases
E)Proteases

Question 9

Quaternary ammonium compounds inactivate bacteria because they

A) Alter metabolic properties of membranes
B)Bind irreversibly to DNA
C)Denature proteins
D)Inactivate 50S ribosomes
E)Oxidize free sulfhydryl groups