D311 Microbiology Verified Multiple
Choice and Conceptual Actual Exam
Questions With Reviewed 100% Correct
Detailed Answers
Guaranteed Pass!!Current Update
1. Which structure is used by bacteria to transfer DNA during conjugation?
A. Flagellum
B. Pilus
C. Capsule
D. Ribosome
2. What is the main function of bacterial ribosomes?
A. DNA replication
B. Protein synthesis
C. Cell wall construction
D. Energy storage
3. What component is unique to Gram-positive bacteria?
A. Teichoic acids
B. Lipopolysaccharides
C. Outer membrane
D. Periplasmic space
4. The term "obligate anaerobe" refers to bacteria that:
A. Prefer oxygen but can survive without it
B. Are killed by oxygen
,C. Only grow in the presence of CO₂
D. Are facultative fermenters
5. Which growth phase has the highest metabolic activity but no cell division?
A. Lag phase
B. Log phase
C. Stationary phase
D. Death phase
6. What is the final electron acceptor in anaerobic respiration (not fermentation)?
A. Oxygen
B. Nitrate or sulfate
C. Carbon dioxide
D. Water
7. Which virus is capable of integrating into the host genome?
A. Influenza virus
B. HIV
C. Hepatitis A virus
D. Rhinovirus
8. Which antibody is produced first during a primary immune response?
A. IgA
B. IgE
C. IgM
D. IgG
9. The purpose of MHC class II molecules is to present antigens to:
A. Cytotoxic T cells
B. Helper T cells
C. B cells
D. NK cells
10. Which lab test uses antibodies to detect the presence of a specific antigen?
A. Western blot
, B. ELISA
C. PCR
D. Gel electrophoresis
11. Which microbe is acid-fast positive?
A. Mycobacterium tuberculosis
B. Streptococcus pneumoniae
C. Neisseria gonorrhoeae
D. Staphylococcus epidermidis
12. Which structure enables spirochetes to move?
A. Pili
B. Axial filaments
C. Flagella
D. Cilia
13. Which enzyme breaks down hydrogen peroxide into water and oxygen?
A. Peroxidase
B. Catalase
C. Coagulase
D. Beta-lactamase
14. Which term describes the spread of disease from animals to humans?
A. Zoonosis
B. Endemic
C. Nosocomial
D. Sporadic
15. Which of the following organisms is eukaryotic?
A. Bacteria
B. Fungi
C. Archaea
D. Mycoplasma
, 16. Which disinfectant works by alkylating DNA and proteins?
A. Formaldehyde
B. Ethanol
C. Hydrogen peroxide
D. Chlorhexidine
17. What is the genome composition of influenza virus?
A. dsDNA
B. Segmented ssRNA
C. Circular ssDNA
D. Linear dsRNA
18. Which test differentiates enteric bacteria by lactose fermentation?
A. Catalase test
B. MacConkey agar
C. Blood agar
D. Mannitol salt agar
19. What process allows bacteria to take up naked DNA from the environment?
A. Transduction
B. Conjugation
C. Transformation
D. Replication
20. A facultative anaerobe can:
A. Grow with or without oxygen
B. Only grow in the absence of oxygen
C. Survive only with oxygen
D. Only ferment sugars
21. What is the result of the action of lysozyme on bacterial cell walls?
A. Lysis of peptidoglycan
B. Blocked protein synthesis
C. DNA damage
D. Endospore formation
Choice and Conceptual Actual Exam
Questions With Reviewed 100% Correct
Detailed Answers
Guaranteed Pass!!Current Update
1. Which structure is used by bacteria to transfer DNA during conjugation?
A. Flagellum
B. Pilus
C. Capsule
D. Ribosome
2. What is the main function of bacterial ribosomes?
A. DNA replication
B. Protein synthesis
C. Cell wall construction
D. Energy storage
3. What component is unique to Gram-positive bacteria?
A. Teichoic acids
B. Lipopolysaccharides
C. Outer membrane
D. Periplasmic space
4. The term "obligate anaerobe" refers to bacteria that:
A. Prefer oxygen but can survive without it
B. Are killed by oxygen
,C. Only grow in the presence of CO₂
D. Are facultative fermenters
5. Which growth phase has the highest metabolic activity but no cell division?
A. Lag phase
B. Log phase
C. Stationary phase
D. Death phase
6. What is the final electron acceptor in anaerobic respiration (not fermentation)?
A. Oxygen
B. Nitrate or sulfate
C. Carbon dioxide
D. Water
7. Which virus is capable of integrating into the host genome?
A. Influenza virus
B. HIV
C. Hepatitis A virus
D. Rhinovirus
8. Which antibody is produced first during a primary immune response?
A. IgA
B. IgE
C. IgM
D. IgG
9. The purpose of MHC class II molecules is to present antigens to:
A. Cytotoxic T cells
B. Helper T cells
C. B cells
D. NK cells
10. Which lab test uses antibodies to detect the presence of a specific antigen?
A. Western blot
, B. ELISA
C. PCR
D. Gel electrophoresis
11. Which microbe is acid-fast positive?
A. Mycobacterium tuberculosis
B. Streptococcus pneumoniae
C. Neisseria gonorrhoeae
D. Staphylococcus epidermidis
12. Which structure enables spirochetes to move?
A. Pili
B. Axial filaments
C. Flagella
D. Cilia
13. Which enzyme breaks down hydrogen peroxide into water and oxygen?
A. Peroxidase
B. Catalase
C. Coagulase
D. Beta-lactamase
14. Which term describes the spread of disease from animals to humans?
A. Zoonosis
B. Endemic
C. Nosocomial
D. Sporadic
15. Which of the following organisms is eukaryotic?
A. Bacteria
B. Fungi
C. Archaea
D. Mycoplasma
, 16. Which disinfectant works by alkylating DNA and proteins?
A. Formaldehyde
B. Ethanol
C. Hydrogen peroxide
D. Chlorhexidine
17. What is the genome composition of influenza virus?
A. dsDNA
B. Segmented ssRNA
C. Circular ssDNA
D. Linear dsRNA
18. Which test differentiates enteric bacteria by lactose fermentation?
A. Catalase test
B. MacConkey agar
C. Blood agar
D. Mannitol salt agar
19. What process allows bacteria to take up naked DNA from the environment?
A. Transduction
B. Conjugation
C. Transformation
D. Replication
20. A facultative anaerobe can:
A. Grow with or without oxygen
B. Only grow in the absence of oxygen
C. Survive only with oxygen
D. Only ferment sugars
21. What is the result of the action of lysozyme on bacterial cell walls?
A. Lysis of peptidoglycan
B. Blocked protein synthesis
C. DNA damage
D. Endospore formation
