4/9/22, 2:28 PM Graded Exam 3
0
My Account
BIO250_Saylor_V5 | Unit 9: Microbial Genetics
Started on Wednesday, March 23, 2022, 2:58 PM
State Finished
Completed on Wednesday, March 23, 2022, 3:15 PM
Time taken 17 mins 22 secs
Grade 85.50 out of 90.00 (95%)
Question 1
What is the difference between mutualism and synergism?
Correct
4.50 points out Select one:
of 4.50
a. In a synergistic relationship, the organisms cannot survive without each
other.
b. In a mutualistic relationship, the organisms are dependent upon each other.
c. In a mutualistic relationship, both organisms benefit, but in a synergistic
relationship both organisms are harmed.
d. In a synergistic relationship, both organisms benefit, but in a mutualistic
relationship both organisms are harmed.
Question 2 Microbes in a biofilm use quorum sensing to
Correct
4.50 points out Select one:
of 4.50 a. assess the size of a particular microbial population.
b. inactivate antibiotic molecules.
c. attach to surfaces.
d. transfer genetic material among individual cells.
This study source was downloaded by 100000836546216 from CourseHero.com on 04-26-2022 13:22:19 GMT -05:00
https://moodle.straighterline.com/mod/quiz/review.php?attempt=4402583 1/9
https://www.coursehero.com/file/143991621/Graded-Exam-3pdf/
, 4/9/22, 2:28 PM Graded Exam 3
0
My Account
Question 3 Endospore-forming bacteria like Bacillus species begin the sporulation process
Correct with an asymmetric cell division to produce two cells with different fates. One will
4.50 points out
differentiate into the endospore, and the other is the sporangium that will ultimately
of 4.50 lyse to release the mature endospore. (Review Process Figure 4.24.) During this
asymmetric cell division, one of the compartments does not receive an intact copy
of the chromosome. Which compartment can function with only part of the
genome and why?
Select one:
a. The sporangium; it supports endospore development and then lyses.
b. The sporangium; much of the genome is "junk DNA" and not required for
endospore maturation.
c. The endospore; it is a dormant stage and requires very little to maintain its
dormancy.
d. The endospore; the endospore is built from the outside via the sporangium
and not from the inside.
Question 4
As described in "A Note About Bacterial Reproduction -- and the "Culture Bias,"" the
Correct organism Epulopiscium does not divide by binary fission. Rather, each cell
4.50 points out increases in size and divides to produce multiple daughter cells that are held within
of 4.50
the original cell well. After lysis, those daughters are released to repeat the
process. Assuming Epulopiscium could be grown in pure culture in the laboratory in
broth and on solid media (it currently cannot), which method would be best for
measuring the increase in biomass during growth?
Select one:
a. Turbidity readings from a spectrophotometer; the increase in biomass will
directly vary with the turbidity of the culture.
b. The viable plate count; each colony derives from a single cell and the number
of colonies equals the number of cells.
c. Direct microscopic count; the experimenter can directly count the number of
cells and extrapolate to the biomass.
d. Chemostat growth; it will prevent the culture from entering the death phase.
This study source was downloaded by 100000836546216 from CourseHero.com on 04-26-2022 13:22:19 GMT -05:00
https://moodle.straighterline.com/mod/quiz/review.php?attempt=4402583 2/9
https://www.coursehero.com/file/143991621/Graded-Exam-3pdf/
0
My Account
BIO250_Saylor_V5 | Unit 9: Microbial Genetics
Started on Wednesday, March 23, 2022, 2:58 PM
State Finished
Completed on Wednesday, March 23, 2022, 3:15 PM
Time taken 17 mins 22 secs
Grade 85.50 out of 90.00 (95%)
Question 1
What is the difference between mutualism and synergism?
Correct
4.50 points out Select one:
of 4.50
a. In a synergistic relationship, the organisms cannot survive without each
other.
b. In a mutualistic relationship, the organisms are dependent upon each other.
c. In a mutualistic relationship, both organisms benefit, but in a synergistic
relationship both organisms are harmed.
d. In a synergistic relationship, both organisms benefit, but in a mutualistic
relationship both organisms are harmed.
Question 2 Microbes in a biofilm use quorum sensing to
Correct
4.50 points out Select one:
of 4.50 a. assess the size of a particular microbial population.
b. inactivate antibiotic molecules.
c. attach to surfaces.
d. transfer genetic material among individual cells.
This study source was downloaded by 100000836546216 from CourseHero.com on 04-26-2022 13:22:19 GMT -05:00
https://moodle.straighterline.com/mod/quiz/review.php?attempt=4402583 1/9
https://www.coursehero.com/file/143991621/Graded-Exam-3pdf/
, 4/9/22, 2:28 PM Graded Exam 3
0
My Account
Question 3 Endospore-forming bacteria like Bacillus species begin the sporulation process
Correct with an asymmetric cell division to produce two cells with different fates. One will
4.50 points out
differentiate into the endospore, and the other is the sporangium that will ultimately
of 4.50 lyse to release the mature endospore. (Review Process Figure 4.24.) During this
asymmetric cell division, one of the compartments does not receive an intact copy
of the chromosome. Which compartment can function with only part of the
genome and why?
Select one:
a. The sporangium; it supports endospore development and then lyses.
b. The sporangium; much of the genome is "junk DNA" and not required for
endospore maturation.
c. The endospore; it is a dormant stage and requires very little to maintain its
dormancy.
d. The endospore; the endospore is built from the outside via the sporangium
and not from the inside.
Question 4
As described in "A Note About Bacterial Reproduction -- and the "Culture Bias,"" the
Correct organism Epulopiscium does not divide by binary fission. Rather, each cell
4.50 points out increases in size and divides to produce multiple daughter cells that are held within
of 4.50
the original cell well. After lysis, those daughters are released to repeat the
process. Assuming Epulopiscium could be grown in pure culture in the laboratory in
broth and on solid media (it currently cannot), which method would be best for
measuring the increase in biomass during growth?
Select one:
a. Turbidity readings from a spectrophotometer; the increase in biomass will
directly vary with the turbidity of the culture.
b. The viable plate count; each colony derives from a single cell and the number
of colonies equals the number of cells.
c. Direct microscopic count; the experimenter can directly count the number of
cells and extrapolate to the biomass.
d. Chemostat growth; it will prevent the culture from entering the death phase.
This study source was downloaded by 100000836546216 from CourseHero.com on 04-26-2022 13:22:19 GMT -05:00
https://moodle.straighterline.com/mod/quiz/review.php?attempt=4402583 2/9
https://www.coursehero.com/file/143991621/Graded-Exam-3pdf/
