©BRIGHTSTARS 2025 ALL RIGHTS RESERVED 9:46 AM A+
Straighterline Micro 250 Final Prep Exam
Questions And Answers |Latest 2025 |
Guaranteed Pass
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 - Answer✔Protozoa
Genetic material can be excised from one chromosome and directly integrated into another via
A. conjugation.
B. transformation.
C. transduction.
1
, ©BRIGHTSTARS 2025 ALL RIGHTS RESERVED 9:46 AM A+
D. transposons. - Answer✔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 - Answer✔TH cell
Which of the following enzymes are used to amplify DNA during PCR?
A. restriction endonuclease
B. DNA polymerase
C. reverse transcriptase
D. DNA ligase - Answer✔DNA polymerase
In the nitrogen cycle, which of the following steps involves removal of nitrogen from the
atmosphere by bacteria? - Answer✔nitrogen fixation, In nitrogen fixation, nitrogen is removed
from the atmosphere by nitrogen-fixing bacteria and converted to ammonia.
2
, ©BRIGHTSTARS 2025 ALL RIGHTS RESERVED 9:46 AM A+
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? - Answer✔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. -
Answer✔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. - Answer✔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.
3
, ©BRIGHTSTARS 2025 ALL RIGHTS RESERVED 9:46 AM A+
c. NADP.
d. photons. - Answer✔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. - Answer✔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." - Answer✔"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
4
Straighterline Micro 250 Final Prep Exam
Questions And Answers |Latest 2025 |
Guaranteed Pass
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 - Answer✔Protozoa
Genetic material can be excised from one chromosome and directly integrated into another via
A. conjugation.
B. transformation.
C. transduction.
1
, ©BRIGHTSTARS 2025 ALL RIGHTS RESERVED 9:46 AM A+
D. transposons. - Answer✔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 - Answer✔TH cell
Which of the following enzymes are used to amplify DNA during PCR?
A. restriction endonuclease
B. DNA polymerase
C. reverse transcriptase
D. DNA ligase - Answer✔DNA polymerase
In the nitrogen cycle, which of the following steps involves removal of nitrogen from the
atmosphere by bacteria? - Answer✔nitrogen fixation, In nitrogen fixation, nitrogen is removed
from the atmosphere by nitrogen-fixing bacteria and converted to ammonia.
2
, ©BRIGHTSTARS 2025 ALL RIGHTS RESERVED 9:46 AM A+
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? - Answer✔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. -
Answer✔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. - Answer✔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.
3
, ©BRIGHTSTARS 2025 ALL RIGHTS RESERVED 9:46 AM A+
c. NADP.
d. photons. - Answer✔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. - Answer✔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." - Answer✔"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
4
