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Straighterline Micro 250 final prep Questions
with Detailed Verified Answers
Which class of eukaryotic microorganisms can be subdivided into groups such as
Mastigophora, Sarcodina, Ciliophora, and Apicomplexa?
A. Helminths
B. Algae
C. Protozoa
D. Fungi Ans: Protozoa
Genetic material can be excised from one chromosome and directly integrated into
another via
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A. conjugation.
B. transformation.
C. transduction.
D. transposons. Ans: transposons.
Which immune cell secretes numerous cytokines that help to coordinate the response
of other immune cells?
A. B cell
B. TH cell
C. TC cell
D. Platelets Ans: TH cell
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Which of the following enzymes are used to amplify DNA during PCR?
A. restriction endonuclease
B. DNA polymerase
C. reverse transcriptase
D. DNA ligase Ans: DNA polymerase
In the nitrogen cycle, which of the following steps involves removal of nitrogen from
the atmosphere by bacteria? Ans: nitrogen fixation, In nitrogen fixation, nitrogen is
removed from the atmosphere by nitrogen-fixing bacteria and converted to ammonia.
If enough h+ ions are added to pure water to raise the H+ concentration of the
solution to ten times higher than the original concentration, what is the resulting OH-
concentration of the solution? Ans: 10 -8M
Fungi are able to reproduce asexually by creating conidiospores and sporangiospores.
Which of the following is an accurate explanation for why it is advantageous that they
are also capable of sexual reproduction?
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Select one:
a. Asexually produced offspring are more likely to compete for resources and will kill
off the parental fungi.
b. Fungi normally produce sexually but produce asexually in harsh conditions such as
severe drought.
c. Offspring from two parents may have variations in form and function that
contribute to survival of the species.
d. Sexual reproduction produces more offspring at a faster rate than spore formation.
Ans: Offspring from two parents may have variations in form and function that
contribute to survival of the species.
In a laboratory bacterial cell culture that has been infected by a virus, plaques are
areas in which
Select one:
a. bacterial cells are resistant to the virus and have not been infected.
b. there is no nutrient available for the bacteria to grow.
c. the virus has spread and left behind the remains of dead cells.
d. the virus has not yet spread to that area of cells. Ans: the virus has spread and
left behind the remains of dead cells.
Straighterline Micro 250 final prep Questions
with Detailed Verified Answers
Which class of eukaryotic microorganisms can be subdivided into groups such as
Mastigophora, Sarcodina, Ciliophora, and Apicomplexa?
A. Helminths
B. Algae
C. Protozoa
D. Fungi Ans: Protozoa
Genetic material can be excised from one chromosome and directly integrated into
another via
, Page | 2
A. conjugation.
B. transformation.
C. transduction.
D. transposons. Ans: transposons.
Which immune cell secretes numerous cytokines that help to coordinate the response
of other immune cells?
A. B cell
B. TH cell
C. TC cell
D. Platelets Ans: TH cell
, Page | 3
Which of the following enzymes are used to amplify DNA during PCR?
A. restriction endonuclease
B. DNA polymerase
C. reverse transcriptase
D. DNA ligase Ans: DNA polymerase
In the nitrogen cycle, which of the following steps involves removal of nitrogen from
the atmosphere by bacteria? Ans: nitrogen fixation, In nitrogen fixation, nitrogen is
removed from the atmosphere by nitrogen-fixing bacteria and converted to ammonia.
If enough h+ ions are added to pure water to raise the H+ concentration of the
solution to ten times higher than the original concentration, what is the resulting OH-
concentration of the solution? Ans: 10 -8M
Fungi are able to reproduce asexually by creating conidiospores and sporangiospores.
Which of the following is an accurate explanation for why it is advantageous that they
are also capable of sexual reproduction?
, Page | 4
Select one:
a. Asexually produced offspring are more likely to compete for resources and will kill
off the parental fungi.
b. Fungi normally produce sexually but produce asexually in harsh conditions such as
severe drought.
c. Offspring from two parents may have variations in form and function that
contribute to survival of the species.
d. Sexual reproduction produces more offspring at a faster rate than spore formation.
Ans: Offspring from two parents may have variations in form and function that
contribute to survival of the species.
In a laboratory bacterial cell culture that has been infected by a virus, plaques are
areas in which
Select one:
a. bacterial cells are resistant to the virus and have not been infected.
b. there is no nutrient available for the bacteria to grow.
c. the virus has spread and left behind the remains of dead cells.
d. the virus has not yet spread to that area of cells. Ans: the virus has spread and
left behind the remains of dead cells.
