Straighterline Micro 250 Final Prep UPDATED Exam Questions and CORRECT Answers
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Straighterline Micro 250
Straighterline Micro 250 Final Prep
UPDATED Exam Questions and
CORRECT 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 - CORRECT ANSWER- Protozoa
Straighterline Micro 250 Final Prep
UPDATED Exam Questions and
CORRECT 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 - CORRECT ANSWER- Protozoa
Genetic material can be excised from one chromosome and directly integrated into another
via
A. conjugation.
B. transformation.
C. transduction.
D. transposons. - CORRECT 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 - CORRECT 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 - CORRECT ANSWER- DNA polymerase
In the nitrogen cycle, which of the following steps involves removal of nitrogen from the
atmosphere by bacteria? - CORRECT ANSWER- 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? - CORRECT 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. -
CORRECT 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. - CORRECT 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.
c. NADP.
d. photons. - CORRECT 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. - CORRECT 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." - CORRECT 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
d. uptake of the drug into the bacterium is diminished - CORRECT ANSWER- 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. - CORRECT ANSWER- 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.
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