MICROBIOLOGY BIO250 STRAIGHTERLINE FULL COURSEGRADEDEXAMS 1,2,3,4,5,6 MIDTERM EXAM(2 VERSIONS) ANDFINALEXAM(2VERSIONS) 2024/2025 AGRADE

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MICROBIOLOGY BIO250 STRAIGHTERLINE FULL COURSE GRADED
EXAMS 1,2,3,4,5,6 MIDTERM EXAM(2 VERSIONS) AND FINAL EXAM (2
VERSIONS) 2024/2025 AGRADE




Straighterline Microbiology Exam 1 BIO250_Saylor_V5

Grade: 81.00 out of 90.00 (90%)

1. Among the types of microorganisms, the are noncellular.
a. viruses

b. helminths
c. protozoans
d. bacteria

2. The wavelength of light used and the numerical aperture governs .
a. illumination
b. resolution

c. magnification
d. size of the field
e. contrast

3. What is the maximum number of electrons in the first energy shell of an
atom?
a. 2

b. 4
c. 8
d. 18
e. 32

4. Thioglycolate medium contains the following: yeast extract, pancreatic digest
of casein, glucose, L-cysteine, sodium chloride, sodium thioglycolate, and
agar. It is considered a complex medium because
a. both yeast extract and pancreatic digest of casein are not chemically defined.

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b. it has multiple ingredients for a broad range of nutrients.
c. depending on their oxygen utilization pattern, organisms will grow differently on
it.
d. thioglycolate has a carbon-sulfur bond that many microbes cannot break
enzymatically.

5. Which of the following is not a pyrimidine?
a. Uracil




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b. Adenine

c. Thymine
d. Cytosine

6. The first cells appeared about billion years ago.
a. 5
b. 4.5
c. 3.5

d. 2
e. 1

7. Which of the following is not an inoculating tool?
a. Petri dish

b. Loop
c. Needle
d. Pipette
e. Swab

8. In the cell cytoplasm, molecules of ATP are a .
a. solute (correct answer)
b. solvent

9. Burning coal produces sulfur dioxide in the atmosphere. When combined with
rain that falls into bodies of water, this leads to
a. an increase in pH level of the water.
b. a greater concentration of OH- ions in the water.
c. a decrease in the pH level of the water.

d. no change in the pH level of the water.

10. Which type of medium would be the best choice when shipping a sample of
bacteria from a clinic to a laboratory for testing?
a. Transport medium

b. Eosin-methylene blue agar
c. Blood agar
d. Thioglycolate medium



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11. The simple microscopes used by the earliest practitioners of microscopy
contained which of the following?
a. Magnifying lens

b. Oil-immersion lens
c. Condenser
d. Ocular
e. Lamp

12. Substances that release ions when dissolved in water and conduct electricity
are .
a. covalent
b. nonpolar
c. electrons
d. electrolytes
e. solvents

13. Hydrogen bonds
a. result from attractive forces between molecules with polar covalent bonds.

b. result from attractive forces between molecules with polar ionic bonds.
c. result from attractive forces between molecules with nonpolar covalent bonds.
d. result from attractive forces between molecules with nonpolar ionic bonds.
e. are the strongest bonds between molecules.

14. A reducing medium contains
a. sugars that can be fermented.
b. extra oxygen.
c. hemoglobin, vitamins, or other growth factors.
d. substances that remove oxygen.
e. inhibiting agents.

15. Which of the following is NOT a recent discovery that has had a huge impact
on the understanding of microbiology?
a. Restriction enzymes
b. PCR technique



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