BIO BIO250L Midterm Exam (GRADED A) Questions and answers | 100% Guaranteed Pass | Straighterline

BIO BIO250L Midterm Exam
Question 1
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Whose work on spontaneous generation first demonstrated the existence of a very heat-
resistant form of bacteria that are called endospores?
Select one:
a. Schwann
b. Redi
c. Tyndall


d. Pasteur
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The correct answer is: Tyndall

Question 2
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The most important aspect of agar that makes it a useful ingredient for solidifying
media for bacterial culture is
Select one:
a. It provides an excellent nitrogen source for bacteria.
b. Bacteria are unable to break it down so it stays solidified.


c. It melts at 100oC and solidifies at temperatures below 50 oC.
d. It provides an excellent carbon and energy source for bacteria.
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The correct answer is: Bacteria are unable to break it down so it stays solidified.

Question 3
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Which of the following best describes the Gram-stain procedure?
Select one:
a. simple staining
b. negative staining
c. differential staining


d. fluorescent staining

, BIO BIO250L Midterm Exam
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The correct answer is: differential staining

Question 4
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A wide variety of microorganisms are commercially used to manufacture for
human consumption.
Select one:
a. vitamins


b. sugars
c. fatty acids
d. none of the choices
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The correct answer is: vitamins

Question 5
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Which of the following is not considered a micronutrient?
Select one:
a. Manganese (Mn)
b. Magnesium (Mg)


c. Zinc (Zn)
d. Copper (Cu)
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The correct answer is: Magnesium (Mg)

Question 6
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You are studying a newly discovered prokaryotic microorganism and are attempting to
determine whether it will be classified in the domain Bacteria or in the domain Archaea.
All of the following would be helpful in making that distinction except
Select one:
a. Sequence of small subunit ribosomal RNA
b. Type of membrane lipids