BIOL 3201 Test 2 Questions and Answers Already Passed Latest Update 2025-2026
after you transferred 1 mil from a 10^-6 dilution tube into a plate, you counted 207 colonies.
How many CFU are present in 1 mL? - Answers 2.07 x 10^8
which of the following uses sunlight for energy and CO2 as a carbon source - Answers
photoautotrophs
a growth medium that favors the growth of some microorganisms but inhibits the growth of
other microorganisms is a ______ medium - Answers selective
the greater the concentration gradient, the faster the rate of diffusion - Answers true
Neiseeria meningitis are cultured on chocolate agar, a medium containing red blood cells that
help cultivate the fastidious Neissaria bacteria to detectable levels. What type of growth
medium is chocolate agar based on the description provided in the question? - Answers
enriched
the majority of nitrogen in soil and marine environments is fixed by - Answers free living bacteria
and archaea
square planar arrangement of cells that forms when round bacteria remain attached to each
other during reproduction are called - Answers tetrads
a medium that has ingredients, such as yeast extract or casein milk proteins, which consist of a
mixture of many chemical species in unknown proportions is commonly referred as - Answers
complex medium
which of the following element combinations include only macronutrients required in large
quantities by many microbes - Answers S, O, Mg, Ca, K
Calculate the number of cfu/mL for the E. coli sample - Answers 2.78 x 10^7
which of the following proteins represents a coupled transport system where 2 molecules travel
in the opposite direction - Answers antiporter
serial dilutions can be used to estimate the total number of bacterial cells, both living and dead,
in a solution - Answers false
you are measuring growth in a bacterial culture. The number of viable cells remained unchanged
throughout the experiment but when you check the medium you found that the carbon source
has been depleted (used up). in which phase of growth is the culture in? - Answers stationary
phase
A growth medium that distinguishes among different groups of bacteria on the basis of their
biological characteristics is called a __________ medium. - Answers differential
after you transferred 1 mil from a 10^-6 dilution tube into a plate, you counted 207 colonies.
How many CFU are present in 1 mL? - Answers 2.07 x 10^8
which of the following uses sunlight for energy and CO2 as a carbon source - Answers
photoautotrophs
a growth medium that favors the growth of some microorganisms but inhibits the growth of
other microorganisms is a ______ medium - Answers selective
the greater the concentration gradient, the faster the rate of diffusion - Answers true
Neiseeria meningitis are cultured on chocolate agar, a medium containing red blood cells that
help cultivate the fastidious Neissaria bacteria to detectable levels. What type of growth
medium is chocolate agar based on the description provided in the question? - Answers
enriched
the majority of nitrogen in soil and marine environments is fixed by - Answers free living bacteria
and archaea
square planar arrangement of cells that forms when round bacteria remain attached to each
other during reproduction are called - Answers tetrads
a medium that has ingredients, such as yeast extract or casein milk proteins, which consist of a
mixture of many chemical species in unknown proportions is commonly referred as - Answers
complex medium
which of the following element combinations include only macronutrients required in large
quantities by many microbes - Answers S, O, Mg, Ca, K
Calculate the number of cfu/mL for the E. coli sample - Answers 2.78 x 10^7
which of the following proteins represents a coupled transport system where 2 molecules travel
in the opposite direction - Answers antiporter
serial dilutions can be used to estimate the total number of bacterial cells, both living and dead,
in a solution - Answers false
you are measuring growth in a bacterial culture. The number of viable cells remained unchanged
throughout the experiment but when you check the medium you found that the carbon source
has been depleted (used up). in which phase of growth is the culture in? - Answers stationary
phase
A growth medium that distinguishes among different groups of bacteria on the basis of their
biological characteristics is called a __________ medium. - Answers differential
