Lab Quiz 6

Question 1

“If a bacterial cell is a halophile, what word best describes their preferred environment compared to the osmotic conditions inside the cell”

a) Hyposmotic/hypotonic
b) Hyperosmotic/hypertonic
c) Halophiles do not have preferences according to osmotic pressure of their environments
d) Isosmotic/isotonic

Answer 1

b. Hyperosmotic/hypertonic

Question 2

“When kinds of media are autoclaved, oxygen is infused into them”

a) True
b) False

Answer 2

b) False

Question 3

“In an attempt to culture a bacterial sample, you incubate it at a variety of temperatures, but find it only grows below zero degrees Celsius (freezing). What is the likely classification of that organism?

a) Extreme thermophiles
b) Thermophiles
c) Mesophile
d) Psychrophile

Answer 3

d) Psychrophile

Question 4

You perform an inoculation of fluid thioglycolate broth. Following incubation, you observe growing bacteria away from the surface of the broth (approximately 1 cm). What kind of organism is this?

a) Obligate aerobes
b) Obligate anaerobes
c) Facultative anaerobes
d) Microaerophiles

Answer 4

d) Microaerophiles

Question 5

Which of the following can grow in both the presence and absence of oxygen?

a) Microaerophiles
b) Facultative anaerobes
c) Obligate aerobes
b) Obligate anaerobes

Answer 5

b) Facultative anaerobes