BIO250 Midterm Exam Unit 9 Microbial Genetics Arizona State University 2025

 BIO250_Saylor_V5
 Unit 9: Microbial Genetics



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Grade 160.00 out of 160.00 (100%)

Question 1
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A reducing medium contains

Select one:
a. sugars that can be fermented.
b. extra oxygen.
c. hemoglobin, vitamins, or other growth factors.

d. substances that remove oxygen.
e. inhibiting agents.
Question 2
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The endosymbiotic theory has been developed to explain the emergence of .

Select one:
a. archaea
b. bacteria
c. prokaryotes

d. eukaryotes
e. viruses
Question 3
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Which of the following is not true about enzymes?

Select one:
a. Enzymes are found in all cells.
b. Enzymes are catalysts.
c. Enzymes participate in the cell's chemical reactions.
d. Enzymes can be denaturated by heat and other agents.

e. Enzymes have high-energy bonds between phosphates.
Question 4
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You have a tube of nutrient broth, in which E. coli is growing. Upon analyzing the broth
chemistry, you find:

oxygen content has dropped a bit, but carbon dioxide has gone up
a lot
formic, acetic, and lactic acids are present

What kind of metabolism has most likely occurred?



Select one:

a. Fermentation
b. Aerobic respiration
c. Anaerobic respiration
d. Photosynthesis
Question 5
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Mediated transport of polar molecules and ions across the plasma membrane utilizes a(n)
carrier that binds to the substance and causes a conformational change to allow its
movement across the membrane.

Select one:

a. protein
b. lipid
c. porin