STRAIGHTERLINE MICRO 250 Final Exam Prep
Questions and Answers Latest 2025
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
Protozoa
Genetic material can be excised from one chromosome and directly integrated
into another via
A. conjugation.
B. transformation.
C. transduction.
D. transposons.
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
TH cell
Which of the following enzymes are used to amplify DNA during PCR?
, STRAIGHTERLINE MICRO 250 Final Exam Prep
Questions and Answers Latest 2025
A. restriction endonuclease
B. DNA polymerase
C. reverse transcriptase
D. DNA ligase
DNA polymerase
In the nitrogen cycle, which of the following steps involves removal of
nitrogen from the atmosphere by bacteria?
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?
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?
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.
Offspring from two parents may have variations in form and function that
contribute to survival of the species.
, STRAIGHTERLINE MICRO 250 Final Exam Prep
Questions and Answers Latest 2025
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.
the virus has spread and left behind the remains of dead cells.
The sun's energy is delivered as discrete packets that travel as waves and
are called
Select one:
a. ATP.
b. carotenoids.
c. NADP.
d. photons.
photons.
Which of the following is a characteristic of aerobic respiration?
Select one:
a. Oxygen-containing ions act as the final electron acceptors in electron
transport.
b. The process includes glycolysis, the Krebs cycle, and the electron
transport chain.
c. Aerobic respiration produces a total of 2 ATP molecules.
d. Aerobic respiration produces lactic acid.
The three stages of aerobic respiration are glycolysis, the Krebs cycle,
and the electron transport chain.
n completing protein synthesis in a prokaryote, what basic message is
carried by a specialized codon that has no corresponding tRNA?
Select one:
a. "Fold peptide chain."
b. "Terminate here."
c. "Add cofactor."
d. "Clip starting amino acid."
, STRAIGHTERLINE MICRO 250 Final Exam Prep
Questions and Answers Latest 2025
"Terminate here." The specialized codon signals the end of protein
synthesis; there is not RNA because it is only needed if the process is to
continue.
Microbial drug resistance can be caused by mutations or by introduction of
new genes into a population. Which of the following can only be caused by
the introduction of new genes into a population?
Select one:
a. a metabolic pathway in the bacterium is shut down
b. binding sites for the drug are reduced in number or affinity to the drug
c. new enzymes that inactivate the drug are synthesized
d. uptake of the drug into the bacterium is diminished
new enzymes that inactivate the drug are synthesized. This can only occur
if new genes are introduced into the population.
Why do the hands, feet, and breasts have more lymphatic vessels for host
defense than other areas of the human body?
Select one:
a. They have a high risk for infection due to frequent contact.
b. They have a greater density of nerves.
c. They require complex movement of fluids from the extremities.
d. They are located a long distance from the thalamus.
They have a high risk for infection due to frequent contact.
Penicillin functions as an antimicrobial agent by inhibiting bacterial
Select one:
a. cell wall synthesis.
b. folic acid synthesis.
c. protein synthesis.
d. RNA and DNA function.
cell wall synthesis. Penicillin belongs to a class of antibacterial agents
that interfere with the production of the material that makes up the
bacterial cell wall. The bacteria must constantly replace this material or
they will become susceptible to rupture due to osmotic pressure.
Questions and Answers Latest 2025
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
Protozoa
Genetic material can be excised from one chromosome and directly integrated
into another via
A. conjugation.
B. transformation.
C. transduction.
D. transposons.
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
TH cell
Which of the following enzymes are used to amplify DNA during PCR?
, STRAIGHTERLINE MICRO 250 Final Exam Prep
Questions and Answers Latest 2025
A. restriction endonuclease
B. DNA polymerase
C. reverse transcriptase
D. DNA ligase
DNA polymerase
In the nitrogen cycle, which of the following steps involves removal of
nitrogen from the atmosphere by bacteria?
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?
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?
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.
Offspring from two parents may have variations in form and function that
contribute to survival of the species.
, STRAIGHTERLINE MICRO 250 Final Exam Prep
Questions and Answers Latest 2025
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.
the virus has spread and left behind the remains of dead cells.
The sun's energy is delivered as discrete packets that travel as waves and
are called
Select one:
a. ATP.
b. carotenoids.
c. NADP.
d. photons.
photons.
Which of the following is a characteristic of aerobic respiration?
Select one:
a. Oxygen-containing ions act as the final electron acceptors in electron
transport.
b. The process includes glycolysis, the Krebs cycle, and the electron
transport chain.
c. Aerobic respiration produces a total of 2 ATP molecules.
d. Aerobic respiration produces lactic acid.
The three stages of aerobic respiration are glycolysis, the Krebs cycle,
and the electron transport chain.
n completing protein synthesis in a prokaryote, what basic message is
carried by a specialized codon that has no corresponding tRNA?
Select one:
a. "Fold peptide chain."
b. "Terminate here."
c. "Add cofactor."
d. "Clip starting amino acid."
, STRAIGHTERLINE MICRO 250 Final Exam Prep
Questions and Answers Latest 2025
"Terminate here." The specialized codon signals the end of protein
synthesis; there is not RNA because it is only needed if the process is to
continue.
Microbial drug resistance can be caused by mutations or by introduction of
new genes into a population. Which of the following can only be caused by
the introduction of new genes into a population?
Select one:
a. a metabolic pathway in the bacterium is shut down
b. binding sites for the drug are reduced in number or affinity to the drug
c. new enzymes that inactivate the drug are synthesized
d. uptake of the drug into the bacterium is diminished
new enzymes that inactivate the drug are synthesized. This can only occur
if new genes are introduced into the population.
Why do the hands, feet, and breasts have more lymphatic vessels for host
defense than other areas of the human body?
Select one:
a. They have a high risk for infection due to frequent contact.
b. They have a greater density of nerves.
c. They require complex movement of fluids from the extremities.
d. They are located a long distance from the thalamus.
They have a high risk for infection due to frequent contact.
Penicillin functions as an antimicrobial agent by inhibiting bacterial
Select one:
a. cell wall synthesis.
b. folic acid synthesis.
c. protein synthesis.
d. RNA and DNA function.
cell wall synthesis. Penicillin belongs to a class of antibacterial agents
that interfere with the production of the material that makes up the
bacterial cell wall. The bacteria must constantly replace this material or
they will become susceptible to rupture due to osmotic pressure.
