MBIO 3401 TopHat Exam Questions &
Answers (Grade A+)
What is a microbe? -
correct answer ✅Prokaryotes, single and multicellular eukaryotes
that do not form tissues, viruses
Which of these numeric aperture and light combinations would
give the best resolution? -
correct answer ✅numeric aperture= 1.2, wavelength= 400nm
You are measuring growth in a bacterial culture. The number of
viable cells is decreasing, and when you check the medium, you
find that the carbon source has been used up. What phase of
growth is the culture in? -
correct answer ✅death phase
Which of the following would be best suited to observe the motility
of microbial cells? -
correct answer ✅phase-contrast microscopy/ wet mount slide
Your friend inoculates a batch of cookie dough with 8 E. coli cells
when he tastes it, and then gets distracted by the TV and beer.
When he finally remembers the dough, there are 64 E. coli cells in
it. How many generations did the bacteria go through? -
correct answer ✅3
,MBIO 3401 TopHat Exam Questions &
Answers (Grade A+)
The flora living in hot springs are which of the following? -
correct answer ✅Thermophile
What do alkaliphiles use in addition to proton motive force to
maintain pH? -
correct answer ✅sodium motive force
Which of the following material CAN survive autoclaving? -
correct answer ✅polypropylene plastic
Which of the methods is NOT sporocidal? -
correct answer ✅70% isopropanol
You accidentally upend a flask of flesh-eating bacteria on your
hand. Assuming no open wounds and acccess to the following
control methods, which of the following would you NOT use to deal
with the bacteria on your hand and arm? -
correct answer ✅ethylene oxide
, MBIO 3401 TopHat Exam Questions &
Answers (Grade A+)
What are bacterial membrane components that reinforce and
stiffen the membrane? -
correct answer ✅hopanoids
The Lipid A moiety in E. coli strain K12 lipopolysaccharide contains
how many acyl chaings? -
correct answer ✅6
All of the following are components of peptidoglycan EXCEPT: -
correct answer ✅lipopolysaccharide
Which of the following septum orientations is correctly matched to
the bacteria? -
correct answer ✅perpendicular planes/ Sarcinae
Directed movements toward or away from a chemical or physical
signal are known as: -
correct answer ✅chemotaxis
Which of the following statements about prokaryotic flagella is
INCORRECT? -
correct answer ✅prokaryotic flagella are composed on tubulin
Answers (Grade A+)
What is a microbe? -
correct answer ✅Prokaryotes, single and multicellular eukaryotes
that do not form tissues, viruses
Which of these numeric aperture and light combinations would
give the best resolution? -
correct answer ✅numeric aperture= 1.2, wavelength= 400nm
You are measuring growth in a bacterial culture. The number of
viable cells is decreasing, and when you check the medium, you
find that the carbon source has been used up. What phase of
growth is the culture in? -
correct answer ✅death phase
Which of the following would be best suited to observe the motility
of microbial cells? -
correct answer ✅phase-contrast microscopy/ wet mount slide
Your friend inoculates a batch of cookie dough with 8 E. coli cells
when he tastes it, and then gets distracted by the TV and beer.
When he finally remembers the dough, there are 64 E. coli cells in
it. How many generations did the bacteria go through? -
correct answer ✅3
,MBIO 3401 TopHat Exam Questions &
Answers (Grade A+)
The flora living in hot springs are which of the following? -
correct answer ✅Thermophile
What do alkaliphiles use in addition to proton motive force to
maintain pH? -
correct answer ✅sodium motive force
Which of the following material CAN survive autoclaving? -
correct answer ✅polypropylene plastic
Which of the methods is NOT sporocidal? -
correct answer ✅70% isopropanol
You accidentally upend a flask of flesh-eating bacteria on your
hand. Assuming no open wounds and acccess to the following
control methods, which of the following would you NOT use to deal
with the bacteria on your hand and arm? -
correct answer ✅ethylene oxide
, MBIO 3401 TopHat Exam Questions &
Answers (Grade A+)
What are bacterial membrane components that reinforce and
stiffen the membrane? -
correct answer ✅hopanoids
The Lipid A moiety in E. coli strain K12 lipopolysaccharide contains
how many acyl chaings? -
correct answer ✅6
All of the following are components of peptidoglycan EXCEPT: -
correct answer ✅lipopolysaccharide
Which of the following septum orientations is correctly matched to
the bacteria? -
correct answer ✅perpendicular planes/ Sarcinae
Directed movements toward or away from a chemical or physical
signal are known as: -
correct answer ✅chemotaxis
Which of the following statements about prokaryotic flagella is
INCORRECT? -
correct answer ✅prokaryotic flagella are composed on tubulin
