ANSWERSHEET
Page |1
STRAIGHTERLINE MICROBIOLOGY ONLINE FINAL
EXAM 2025| BRAND NEW ACTUAL EXAM WITH 100%
VERIFIED QUESTIONS AND CORRECT SOLUTIONS|
GUARANTEED VALUE PACK| ACE YOUR GRADES.
1. Which of the following is NOT true regarding ATP synthases?
a. They require proton motive force to make ATP.
b. They span the inner membrane of mitochondria.
c. The proton flow is outward during ATP synthesis.
d. The subunits of ATP synthase undergo conformational changes
during ATP production. - correct answer - c. The proton flow is
outward during ATP synthesis.
2. A purine or pyrimidine that is attached to a sugar, either ribose or
deoxyribose, which is attached to one or more phosphate groups is
called a _______.
a. nucleotide
b. nucleoside
c. nitrogenous base
d. nucleic acid - correct answer - a. nucleotide
3. What might be a reason for the accumulation of improperly folded
protein complexes in the bacterial cell cytoplasm following translation?
1
,ANSWERSHEET
Page |2
a. A problem exists with the functioning of molecular chaperones.
b. The cell is synthesizing proteins too rapidly.
c. Polysomes are forming on the mRNA.
d. The proteins are being transcribed but not translated. - correct
answer - a. A problem exists with the functioning of molecular
chaperones.
4. The portion of the tRNA molecule that binds to the codon on the mRNA
is called the...
a. c-codon.
b. anticodon.
c. complementary codon.
d. paracodon. - correct answer - b. anticodon.
5. Predict the experimental outcome if Hershey and Chase had used a
bacterial cell instead of a bacteriophage in the procedure.
a. Radioactivity would be detected in the supernatant but not in the
pellet.
b. Radioactivity would be detected in the pellet but not in the
supernatant.
c. Radioactivity would be detected in both the supernatant and pellet.
d. Radioactivity would be detected in neither the supernatant nor the
pellet. - correct answer - a. Radioactivity would be detected in the
supernatant but not in the pellet.
2
,ANSWERSHEET
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6. Bioluminescence in Vibrio harveyi is due to an alternate sigma factor
that prevents from binding to Lux mRNA, thus allowing translation of
bioluminescent genes.
a. antisense
b. phosphate
c. ribosomes
d. autoinducing proteins - correct answer - a. antisense
7. ________ molecules deliver amino acids to ribosomes during
translation.
a. Messenger RNA (mRNA)
b. Transfer RNA (tRNA)
c. Ribosomal RNA (rRNA)
d. Heterogeneous nuclear RNA (hnRNA) - correct answer - b.
Transfer RNA (tRNA)
8. Repair of an apurinic or apyrimidinic site in DNA by AP endonuclease
must be completed by the action of...
a. UvrABC endonuclease.
b. RecA protein.
c. DNA polymerase I.
d. None of the choices are correct. - correct answer - c. DNA
polymerase I.
3
, ANSWERSHEET
Page |4
9. In the nitrogen cycle, which of the following steps involves removal of
nitrogen from the atmosphere by bacteria?
a. ammonification
b. denitrification
c. nitrification
d. nitrogen fixation - correct answer - d. nitrogen fixation
10. Denitrification - correct answer - the step in the nitrogen cycle in
which bacteria turn ammonia into that is released into the atmosphere.
11. If enough H+ ions are added to pure water to raise the concentration
of the solution to ten times higher than the original concentration, what is
the resulting OH- concentration of the solution?
a. 10^-5 M
b. 10^-6 M
c. 10^-7 M
d. 10^-8 M - correct answer - d. 10^-8 M
12. 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?
a. Asexually produced offspring are more likely to compete for
resources and will kill off the parental fungi.
4
Page |1
STRAIGHTERLINE MICROBIOLOGY ONLINE FINAL
EXAM 2025| BRAND NEW ACTUAL EXAM WITH 100%
VERIFIED QUESTIONS AND CORRECT SOLUTIONS|
GUARANTEED VALUE PACK| ACE YOUR GRADES.
1. Which of the following is NOT true regarding ATP synthases?
a. They require proton motive force to make ATP.
b. They span the inner membrane of mitochondria.
c. The proton flow is outward during ATP synthesis.
d. The subunits of ATP synthase undergo conformational changes
during ATP production. - correct answer - c. The proton flow is
outward during ATP synthesis.
2. A purine or pyrimidine that is attached to a sugar, either ribose or
deoxyribose, which is attached to one or more phosphate groups is
called a _______.
a. nucleotide
b. nucleoside
c. nitrogenous base
d. nucleic acid - correct answer - a. nucleotide
3. What might be a reason for the accumulation of improperly folded
protein complexes in the bacterial cell cytoplasm following translation?
1
,ANSWERSHEET
Page |2
a. A problem exists with the functioning of molecular chaperones.
b. The cell is synthesizing proteins too rapidly.
c. Polysomes are forming on the mRNA.
d. The proteins are being transcribed but not translated. - correct
answer - a. A problem exists with the functioning of molecular
chaperones.
4. The portion of the tRNA molecule that binds to the codon on the mRNA
is called the...
a. c-codon.
b. anticodon.
c. complementary codon.
d. paracodon. - correct answer - b. anticodon.
5. Predict the experimental outcome if Hershey and Chase had used a
bacterial cell instead of a bacteriophage in the procedure.
a. Radioactivity would be detected in the supernatant but not in the
pellet.
b. Radioactivity would be detected in the pellet but not in the
supernatant.
c. Radioactivity would be detected in both the supernatant and pellet.
d. Radioactivity would be detected in neither the supernatant nor the
pellet. - correct answer - a. Radioactivity would be detected in the
supernatant but not in the pellet.
2
,ANSWERSHEET
Page |3
6. Bioluminescence in Vibrio harveyi is due to an alternate sigma factor
that prevents from binding to Lux mRNA, thus allowing translation of
bioluminescent genes.
a. antisense
b. phosphate
c. ribosomes
d. autoinducing proteins - correct answer - a. antisense
7. ________ molecules deliver amino acids to ribosomes during
translation.
a. Messenger RNA (mRNA)
b. Transfer RNA (tRNA)
c. Ribosomal RNA (rRNA)
d. Heterogeneous nuclear RNA (hnRNA) - correct answer - b.
Transfer RNA (tRNA)
8. Repair of an apurinic or apyrimidinic site in DNA by AP endonuclease
must be completed by the action of...
a. UvrABC endonuclease.
b. RecA protein.
c. DNA polymerase I.
d. None of the choices are correct. - correct answer - c. DNA
polymerase I.
3
, ANSWERSHEET
Page |4
9. In the nitrogen cycle, which of the following steps involves removal of
nitrogen from the atmosphere by bacteria?
a. ammonification
b. denitrification
c. nitrification
d. nitrogen fixation - correct answer - d. nitrogen fixation
10. Denitrification - correct answer - the step in the nitrogen cycle in
which bacteria turn ammonia into that is released into the atmosphere.
11. If enough H+ ions are added to pure water to raise the concentration
of the solution to ten times higher than the original concentration, what is
the resulting OH- concentration of the solution?
a. 10^-5 M
b. 10^-6 M
c. 10^-7 M
d. 10^-8 M - correct answer - d. 10^-8 M
12. 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?
a. Asexually produced offspring are more likely to compete for
resources and will kill off the parental fungi.
4
