WGU D311: Microbiology OA Verified Multiple Choice and
Conceptual Actual Final Exam Questions With Reviewed
100% Correct Detailed Answers
Guaranteed Pass!!Current Update
1. Which of the following structures is used by bacteria for motility?
A. Pili
B. Capsule
C. Fimbriae
D. Flagella
2. A Gram-negative cell wall contains which of the following?
A. Thick peptidoglycan
B. Teichoic acid
C. No outer membrane
D. Lipopolysaccharide (LPS)
3. What occurs during the log phase of bacterial growth?
A. Cell death equals cell production
B. Rapid exponential cell division
C. Metabolic dormancy
D. No cell division
4. Which laboratory test is used to assess bacterial susceptibility to
antibiotics?
A. Gram stain
B. Acid-fast stain
C. Coagulase test
D. Kirby-Bauer test
5. What is the primary component of bacterial endospores that gives them
resistance?
A. Peptidoglycan
B. DNA polymerase
C. Lipid envelope
D. Dipicolinic acid
6. Which process describes transfer of DNA between bacteria via
bacteriophages?
A. Conjugation
,B. Transformation
C. Transduction
D. Translation
7. Which virus uses reverse transcriptase to replicate?
A. Influenza
B. Herpes simplex
C. Coronavirus
D. HIV
8. Which antibody class is primarily found in secretions (saliva, mucus,
breast milk)?
A. IgG
B. IgE
C. IgM
D. IgA
9. Which is the first line of defense in the innate immune system?
A. Antibodies
B. Cytotoxic T-cells
C. Mucous membranes
D. Memory B-cells
10. What is the purpose of pasteurization?
A. Sterilize food
B. Kill spores
C. Increase food acidity
D. Reduce microbial load without affecting taste
11. In the lac operon, lactose acts as a(n):
A. Repressor
B. Corepressor
C. Inducer
D. Operator
12. A positive catalase test differentiates:
A. E. coli from Salmonella
B. Staphylococcus from Streptococcus
C. Mycobacterium from Nocardia
D. Clostridium from Bacillus
13. What is a fomite?
, A. Insect vector
B. Water droplet
C. Non-living object that transmits disease
D. Airborne microbe
14. Which bacteria produce exotoxins that cause botulism?
A. Staphylococcus aureus
B. Bacillus anthracis
C. Clostridium botulinum
D. Pseudomonas aeruginosa
15. Which term describes a disease that spreads worldwide?
A. Endemic
B. Epidemic
C. Pandemic
D. Sporadic
16. What is a characteristic of viruses?
A. Reproduce by binary fission
B. Contain ribosomes
C. Are obligate intracellular parasites
D. Have cell walls
17. Which method provides true sterilization?
A. Boiling
B. Alcohol
C. Autoclaving
D. Pasteurization
18. Which molecule is found only in Gram-negative bacteria?
A. Teichoic acid
B. Mycolic acid
C. Lipopolysaccharide
D. Peptidoglycan
19. What is the function of the bacterial capsule?
A. Reproduction
B. Protein synthesis
C. Evading phagocytosis
D. Motility
20. The MHC class I complex presents antigens to:
Conceptual Actual Final Exam Questions With Reviewed
100% Correct Detailed Answers
Guaranteed Pass!!Current Update
1. Which of the following structures is used by bacteria for motility?
A. Pili
B. Capsule
C. Fimbriae
D. Flagella
2. A Gram-negative cell wall contains which of the following?
A. Thick peptidoglycan
B. Teichoic acid
C. No outer membrane
D. Lipopolysaccharide (LPS)
3. What occurs during the log phase of bacterial growth?
A. Cell death equals cell production
B. Rapid exponential cell division
C. Metabolic dormancy
D. No cell division
4. Which laboratory test is used to assess bacterial susceptibility to
antibiotics?
A. Gram stain
B. Acid-fast stain
C. Coagulase test
D. Kirby-Bauer test
5. What is the primary component of bacterial endospores that gives them
resistance?
A. Peptidoglycan
B. DNA polymerase
C. Lipid envelope
D. Dipicolinic acid
6. Which process describes transfer of DNA between bacteria via
bacteriophages?
A. Conjugation
,B. Transformation
C. Transduction
D. Translation
7. Which virus uses reverse transcriptase to replicate?
A. Influenza
B. Herpes simplex
C. Coronavirus
D. HIV
8. Which antibody class is primarily found in secretions (saliva, mucus,
breast milk)?
A. IgG
B. IgE
C. IgM
D. IgA
9. Which is the first line of defense in the innate immune system?
A. Antibodies
B. Cytotoxic T-cells
C. Mucous membranes
D. Memory B-cells
10. What is the purpose of pasteurization?
A. Sterilize food
B. Kill spores
C. Increase food acidity
D. Reduce microbial load without affecting taste
11. In the lac operon, lactose acts as a(n):
A. Repressor
B. Corepressor
C. Inducer
D. Operator
12. A positive catalase test differentiates:
A. E. coli from Salmonella
B. Staphylococcus from Streptococcus
C. Mycobacterium from Nocardia
D. Clostridium from Bacillus
13. What is a fomite?
, A. Insect vector
B. Water droplet
C. Non-living object that transmits disease
D. Airborne microbe
14. Which bacteria produce exotoxins that cause botulism?
A. Staphylococcus aureus
B. Bacillus anthracis
C. Clostridium botulinum
D. Pseudomonas aeruginosa
15. Which term describes a disease that spreads worldwide?
A. Endemic
B. Epidemic
C. Pandemic
D. Sporadic
16. What is a characteristic of viruses?
A. Reproduce by binary fission
B. Contain ribosomes
C. Are obligate intracellular parasites
D. Have cell walls
17. Which method provides true sterilization?
A. Boiling
B. Alcohol
C. Autoclaving
D. Pasteurization
18. Which molecule is found only in Gram-negative bacteria?
A. Teichoic acid
B. Mycolic acid
C. Lipopolysaccharide
D. Peptidoglycan
19. What is the function of the bacterial capsule?
A. Reproduction
B. Protein synthesis
C. Evading phagocytosis
D. Motility
20. The MHC class I complex presents antigens to:
