1. What is the primary cause of antibiotic resistance in bacteria?
A. Mutations and horizontal gene transfer
B. Decrease in bacterial population
C. Use of vaccines
D. Increased phagocytosis
Answer: a) Mutations and horizontal gene transfer
Rationale: Antibiotic resistance occurs primarily due to mutations and horizontal gene
transfer, allowing bacteria to acquire resistance genes.
2. Which of the following organisms can cause neonatal meningitis?
A. Streptococcus pneumoniae
B. Neisseria meningitidis
C. Listeria monocytogenes
D. Haemophilus influenzae
Answer: c) Listeria monocytogenes
Rationale: Listeria monocytogenes can cause neonatal meningitis, particularly in infants
born to infected mothers.
3. Which of the following best describes the term "antiseptic"?
A. A chemical agent used to destroy bacteria on non-living surfaces.
B. A substance used to kill bacteria in the air.
C. A substance used to inhibit the growth of microorganisms on living tissues.
D. A method to sterilize equipment by exposure to heat.
Answer: c) A substance used to inhibit the growth of microorganisms on living tissues.
Rationale: Antiseptics are used to prevent or reduce infection by inhibiting the growth
of microorganisms on living tissues.
4. What is the main cause of malaria?
A. Plasmodium
B. Toxoplasma
C. Trypanosoma
D. Entamoeba histolytica
Answer: a) Plasmodium
Rationale: Malaria is caused by Plasmodium species, transmitted by the Anopheles
mosquito.
5. What is the most common bacterial shape for Escherichia coli?
A. Coccus
B. Bacillus
C. Spirillum
D. Filamentous
Answer: b) Bacillus
Rationale: Escherichia coli is a rod-shaped (bacillus) bacterium.
6. What is the mechanism of action for penicillin?
A. Inhibits protein synthesis
B. Inhibits DNA replication
C. Disrupts the cell wall synthesis
, D. Inhibits RNA transcription
Answer: c) Disrupts the cell wall synthesis
Rationale: Penicillin works by inhibiting the synthesis of peptidoglycan, a crucial
component of bacterial cell walls, leading to cell lysis.
7. Which of the following is the causative agent of syphilis?
A. Treponema pallidum
B. Neisseria gonorrhoeae
C. Chlamydia trachomatis
D. Mycoplasma genitalium
Answer: a) Treponema pallidum
Rationale: Treponema pallidum is the spirochete responsible for syphilis.
8. Which of the following is a characteristic of eukaryotic cells?
A. Lack of a nucleus
B. Presence of a membrane-bound nucleus
C. Presence of plasmids
D. Presence of a single chromosome
Answer: b) Presence of a membrane-bound nucleus
Rationale: Eukaryotic cells have a membrane-bound nucleus and other organelles,
distinguishing them from prokaryotic cells.
9. Which organism is responsible for causing tuberculosis?
A. Streptococcus pneumoniae
B. Mycobacterium tuberculosis
C. Escherichia coli
D. Clostridium botulinum
Answer: b) Mycobacterium tuberculosis
Rationale: Mycobacterium tuberculosis is the bacterium responsible for causing
tuberculosis, a lung disease.
10. What is the term used to describe the ability of a pathogen to cause disease?
A. Virulence
B. Pathogenicity
C. Incubation period
D. Resistance
Answer: b) Pathogenicity
Rationale: Pathogenicity refers to the ability of an organism to cause disease, while
virulence is the degree of pathogenicity.
11. Which of the following is a function of the bacterial capsule?
A. Protein synthesis
B. Protection against phagocytosis
C. Genetic material replication
D. Energy production
Answer: b) Protection against phagocytosis
Rationale: The bacterial capsule helps protect bacteria from being engulfed by host
immune cells.
12. Which of the following is a characteristic of archaea?
A. Mutations and horizontal gene transfer
B. Decrease in bacterial population
C. Use of vaccines
D. Increased phagocytosis
Answer: a) Mutations and horizontal gene transfer
Rationale: Antibiotic resistance occurs primarily due to mutations and horizontal gene
transfer, allowing bacteria to acquire resistance genes.
2. Which of the following organisms can cause neonatal meningitis?
A. Streptococcus pneumoniae
B. Neisseria meningitidis
C. Listeria monocytogenes
D. Haemophilus influenzae
Answer: c) Listeria monocytogenes
Rationale: Listeria monocytogenes can cause neonatal meningitis, particularly in infants
born to infected mothers.
3. Which of the following best describes the term "antiseptic"?
A. A chemical agent used to destroy bacteria on non-living surfaces.
B. A substance used to kill bacteria in the air.
C. A substance used to inhibit the growth of microorganisms on living tissues.
D. A method to sterilize equipment by exposure to heat.
Answer: c) A substance used to inhibit the growth of microorganisms on living tissues.
Rationale: Antiseptics are used to prevent or reduce infection by inhibiting the growth
of microorganisms on living tissues.
4. What is the main cause of malaria?
A. Plasmodium
B. Toxoplasma
C. Trypanosoma
D. Entamoeba histolytica
Answer: a) Plasmodium
Rationale: Malaria is caused by Plasmodium species, transmitted by the Anopheles
mosquito.
5. What is the most common bacterial shape for Escherichia coli?
A. Coccus
B. Bacillus
C. Spirillum
D. Filamentous
Answer: b) Bacillus
Rationale: Escherichia coli is a rod-shaped (bacillus) bacterium.
6. What is the mechanism of action for penicillin?
A. Inhibits protein synthesis
B. Inhibits DNA replication
C. Disrupts the cell wall synthesis
, D. Inhibits RNA transcription
Answer: c) Disrupts the cell wall synthesis
Rationale: Penicillin works by inhibiting the synthesis of peptidoglycan, a crucial
component of bacterial cell walls, leading to cell lysis.
7. Which of the following is the causative agent of syphilis?
A. Treponema pallidum
B. Neisseria gonorrhoeae
C. Chlamydia trachomatis
D. Mycoplasma genitalium
Answer: a) Treponema pallidum
Rationale: Treponema pallidum is the spirochete responsible for syphilis.
8. Which of the following is a characteristic of eukaryotic cells?
A. Lack of a nucleus
B. Presence of a membrane-bound nucleus
C. Presence of plasmids
D. Presence of a single chromosome
Answer: b) Presence of a membrane-bound nucleus
Rationale: Eukaryotic cells have a membrane-bound nucleus and other organelles,
distinguishing them from prokaryotic cells.
9. Which organism is responsible for causing tuberculosis?
A. Streptococcus pneumoniae
B. Mycobacterium tuberculosis
C. Escherichia coli
D. Clostridium botulinum
Answer: b) Mycobacterium tuberculosis
Rationale: Mycobacterium tuberculosis is the bacterium responsible for causing
tuberculosis, a lung disease.
10. What is the term used to describe the ability of a pathogen to cause disease?
A. Virulence
B. Pathogenicity
C. Incubation period
D. Resistance
Answer: b) Pathogenicity
Rationale: Pathogenicity refers to the ability of an organism to cause disease, while
virulence is the degree of pathogenicity.
11. Which of the following is a function of the bacterial capsule?
A. Protein synthesis
B. Protection against phagocytosis
C. Genetic material replication
D. Energy production
Answer: b) Protection against phagocytosis
Rationale: The bacterial capsule helps protect bacteria from being engulfed by host
immune cells.
12. Which of the following is a characteristic of archaea?
