Medical Microbiology Exam 2 with complete solution
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Course
Medical Microbiology
Institution
Medical Microbiology
Which of the following forms of oxygen is detoxified by the enzyme catalase?
A) singlet oxygen
B) hydroxyl radical
C) hydrogen peroxide
D) superoxide
E) Oprah's oxygen network
C) hydrogen peroxide
A microbiologist inoculates a growth medium at Time 0 with 400 bacterial cells per mL. If...
Medical Microbiology Exam 2 with
complete solution
Which of the following forms of oxygen is detoxified by the enzyme catalase?
A) singlet oxygen
B) hydroxyl radical
C) hydrogen peroxide
D) superoxide
E) Oprah's oxygen network - ANSWER- C) hydrogen peroxide
A microbiologist inoculates a growth medium at Time 0 with 400 bacterial cells
per mL. If the generation time of the species is 30 minutes, and there is no lag
phase, what is the shortest incubation time before the culture reaches a
population of more than 6000 cells per mL?
A) 1 hour
B) 2 hours
C) 3 hours
D) about 7.5 hours
E) no less than 24 hours - ANSWER- B) 2 hours
What types of microbes could be found growing at the very top of tubes of TSA?
A) obligate aerobes and microaerophiles
B) facultative anaerobes and obligate anaerobes
C) aerotolerant anaerobes and facultative anaerobes
D) microaerophiles and obligate anaerobes
E) obligate anaerobes and obligate aerobes - ANSWER- B) facultative anaerobes
and obligate anaerobes
Most human pathogens are in the growth temperature category of:
A) thermoduric
B) thermophiles
C) mesophiles
D) hyperthermophiles
, E) tempophiles - ANSWER- C) mesophiles
In microbiology, the term growth usually refers to an increase in:
A) a microbe's diameter and or length
B) the amount of ATP produced based on mass
C) the population of microbial cells
D) the replication points on the DNA
E) cell shoe size - ANSWER- C) the population of microbial cells
The use of salt and sugar in preserving various types of foods is an application of
which of the following concepts?
A) nitrogen fixation
B) chemical inhibition
C) pH
D) Aw, water activity
E) spicy cooking - ANSWER- D) Aw, water activity
Which of the following would be a non-effective means of sterilization, resulting
in surviving cells?
A) ionizing gamma radiation
B) freezing
C) autoclaving
D) incineration
E) dry heat treatment - ANSWER- B) freezing
Disinfection means:
A) killing all forms of microbes, even endospores
B) killing the majority (at least 51%) of bacteria
C) inhibiting the growth of 99.99% of the bacterial population
D) removing or killing the pathogenic bacteria
E) damaging the sex pilus so conjugation can't take place - ANSWER- D)
removing or killing the pathogenic bacteria
Transformation and conjugation in bacterial both have this common feature:
A) mutant genes make an F- pilus
B) the DNA that is transferred is released by the dead recipient cell
C) the recipient cell always becomes F+
D) the recipient acquires some genetic characteristic from the donor cell
E) cell to cell contact is always required - ANSWER- D) the recipient acquires
some genetic characteristic from the donor cell
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