BIOLOGY 299 Exam 2.
BIOLOGY 299 Exam 2.
Question text
A bacterium is inoculated into a tube of nutrient broth and incubated. After
incubation, it appears turbid throughout, top to bottom, with the most amount of
turbidty at the very top. This bacterium would be called a:
Select one:
a. aerotolerant
b. microaerophile
c. obligate aerobe
d. facultative anaerobe
e. psychrotroph
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The correct answer is: facultative anaerobe
Question 2
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You inoculate the bacterium into 3 tubes of nutrient broth medium containing
salt--0.5% NaCl, 5% NaCl, and 15% NaCl. After incubation, you notice that the
organism is growing very well in the 15%, and somewhat in the 5%. There is no
growth in the third tube. This organism would be called:
Select one:
a. haloduric
b. osmophobic
,BIOLOGY 299 Exam 2.
,BIOLOGY 299 Exam 2.
c. halophilic
d. barophilic
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The correct answer is: halophilic
Question 3
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Mixed acid fermentation
Select one:
a. produces butyric acid.
b. occurs in all bacteria.
c. produces several different acids plus CO2 and H2 gases.
d. is seen in Streptococcus and Lactobacillus.
e. also produces ethanol.
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The correct answer is: produces several different acids plus CO2 and H2 gases.
Question 4
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Which of the following is not true of transposons?
Select one:
a. can change pigmentation
, BIOLOGY 299 Exam 2.
b. can replace damaged DNA
c. can transfer drug resistance
d. can change the genome
e. are always part of plasmids
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The correct answer is: are always part of plasmids
Question 5
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A bacteriophage transfers a random fragment of DNA of the previous host to the
current host. This is an example of
Select one:
a. conjugation.
b. generalized transduction.
c. specialized transduction.
d. creation of an Hfr cell.
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The correct answer is: generalized transduction.
Question 6
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Question text
Human pathogens fall into the group called
BIOLOGY 299 Exam 2.
Question text
A bacterium is inoculated into a tube of nutrient broth and incubated. After
incubation, it appears turbid throughout, top to bottom, with the most amount of
turbidty at the very top. This bacterium would be called a:
Select one:
a. aerotolerant
b. microaerophile
c. obligate aerobe
d. facultative anaerobe
e. psychrotroph
Feedback
The correct answer is: facultative anaerobe
Question 2
Correct
Mark 1.00 out of 1.00
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Question text
You inoculate the bacterium into 3 tubes of nutrient broth medium containing
salt--0.5% NaCl, 5% NaCl, and 15% NaCl. After incubation, you notice that the
organism is growing very well in the 15%, and somewhat in the 5%. There is no
growth in the third tube. This organism would be called:
Select one:
a. haloduric
b. osmophobic
,BIOLOGY 299 Exam 2.
,BIOLOGY 299 Exam 2.
c. halophilic
d. barophilic
Feedback
The correct answer is: halophilic
Question 3
Correct
Mark 1.00 out of 1.00
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Question text
Mixed acid fermentation
Select one:
a. produces butyric acid.
b. occurs in all bacteria.
c. produces several different acids plus CO2 and H2 gases.
d. is seen in Streptococcus and Lactobacillus.
e. also produces ethanol.
Feedback
The correct answer is: produces several different acids plus CO2 and H2 gases.
Question 4
Correct
Mark 1.00 out of 1.00
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Question text
Which of the following is not true of transposons?
Select one:
a. can change pigmentation
, BIOLOGY 299 Exam 2.
b. can replace damaged DNA
c. can transfer drug resistance
d. can change the genome
e. are always part of plasmids
Feedback
The correct answer is: are always part of plasmids
Question 5
Correct
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Question text
A bacteriophage transfers a random fragment of DNA of the previous host to the
current host. This is an example of
Select one:
a. conjugation.
b. generalized transduction.
c. specialized transduction.
d. creation of an Hfr cell.
Feedback
The correct answer is: generalized transduction.
Question 6
Correct
Mark 1.00 out of 1.00
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Question text
Human pathogens fall into the group called
