Microbiology Study Guide 2026/2027
Complete Questions with Reviewed Correct
Answers || Newest Version
Description:
This study guide contains 100 multiple-choice questions on core microbiology topics, including
bacteria, viruses, fungi, protozoa, microbial growth, metabolism, immunity, disease-causing
microorganisms, and medical and industrial applications. It is designed for revision, self-testing,
and exam preparation.
Keywords:
Microbiology, bacteria, viruses, fungi, protozoa, microbial growth, metabolism, immunity,
infection, pathogens, antibiotics, sterilization, immunity, vaccines, microbiology MCQs, study
guide 2026/2027
Questions
1. Microbiology is the study of:
A. Rocks and minerals
B. Living organisms visible only with a microscope ✅✅✅
C. Weather patterns
D. Human bones
2. Which of the following is a prokaryotic microorganism?
A. Amoeba
B. Bacterium ✅✅✅
C. Fungus
D. Algae
3. Which structure is absent in prokaryotic cells?
A. Ribosomes
B. Plasma membrane
C. True nucleus ✅✅✅
D. Cytoplasm
4. The main genetic material of bacteria is found in the:
,A. Mitochondria
B. Nucleoid ✅✅✅
C. Golgi body
D. Lysosome
5. Which of the following microorganisms is acellular?
A. Bacteria
B. Fungi
C. Virus ✅✅✅
D. Protozoa
6. The basic shape of spherical bacteria is called:
A. Bacillus
B. Spirillum
C. Coccus ✅✅✅
D. Vibrio
7. Rod-shaped bacteria are called:
A. Cocci
B. Bacilli ✅✅✅
C. Spirochetes
D. Vibrios
8. Spiral-shaped bacteria are generally called:
A. Bacilli
B. Cocci
C. Spirilla ✅✅✅
D. Diplococci
9. A cluster of spherical bacteria is called:
A. Streptococci
B. Staphylococci ✅✅✅
C. Diplobacilli
D. Vibrios
10. A chain of cocci is called:
A. Staphylococci
B. Streptococci ✅✅✅
, C. Tetrads
D. Spirilla
11. The bacterial cell wall is mainly composed of:
A. Cellulose
B. Peptidoglycan ✅✅✅
C. Chitin
D. Glycogen
12. Gram-positive bacteria stain:
A. Pink
B. Green
C. Purple ✅✅✅
D. Yellow
13. Gram-negative bacteria appear pink after Gram staining because they:
A. Have thick peptidoglycan
B. Retain crystal violet strongly
C. Lose crystal violet and take up safranin ✅✅✅
D. Have no cell wall
14. The external slimy layer that helps bacteria attach to surfaces is the:
A. Capsule ✅✅✅
B. Flagellum
C. Ribosome
D. Plasmid
15. Which bacterial structure is mainly responsible for motility?
A. Pili
B. Capsule
C. Flagellum ✅✅✅
D. Endospore
16. Pili are mainly used for:
A. Energy production
B. Attachment and conjugation ✅✅✅
C. Photosynthesis
D. Protein synthesis
Complete Questions with Reviewed Correct
Answers || Newest Version
Description:
This study guide contains 100 multiple-choice questions on core microbiology topics, including
bacteria, viruses, fungi, protozoa, microbial growth, metabolism, immunity, disease-causing
microorganisms, and medical and industrial applications. It is designed for revision, self-testing,
and exam preparation.
Keywords:
Microbiology, bacteria, viruses, fungi, protozoa, microbial growth, metabolism, immunity,
infection, pathogens, antibiotics, sterilization, immunity, vaccines, microbiology MCQs, study
guide 2026/2027
Questions
1. Microbiology is the study of:
A. Rocks and minerals
B. Living organisms visible only with a microscope ✅✅✅
C. Weather patterns
D. Human bones
2. Which of the following is a prokaryotic microorganism?
A. Amoeba
B. Bacterium ✅✅✅
C. Fungus
D. Algae
3. Which structure is absent in prokaryotic cells?
A. Ribosomes
B. Plasma membrane
C. True nucleus ✅✅✅
D. Cytoplasm
4. The main genetic material of bacteria is found in the:
,A. Mitochondria
B. Nucleoid ✅✅✅
C. Golgi body
D. Lysosome
5. Which of the following microorganisms is acellular?
A. Bacteria
B. Fungi
C. Virus ✅✅✅
D. Protozoa
6. The basic shape of spherical bacteria is called:
A. Bacillus
B. Spirillum
C. Coccus ✅✅✅
D. Vibrio
7. Rod-shaped bacteria are called:
A. Cocci
B. Bacilli ✅✅✅
C. Spirochetes
D. Vibrios
8. Spiral-shaped bacteria are generally called:
A. Bacilli
B. Cocci
C. Spirilla ✅✅✅
D. Diplococci
9. A cluster of spherical bacteria is called:
A. Streptococci
B. Staphylococci ✅✅✅
C. Diplobacilli
D. Vibrios
10. A chain of cocci is called:
A. Staphylococci
B. Streptococci ✅✅✅
, C. Tetrads
D. Spirilla
11. The bacterial cell wall is mainly composed of:
A. Cellulose
B. Peptidoglycan ✅✅✅
C. Chitin
D. Glycogen
12. Gram-positive bacteria stain:
A. Pink
B. Green
C. Purple ✅✅✅
D. Yellow
13. Gram-negative bacteria appear pink after Gram staining because they:
A. Have thick peptidoglycan
B. Retain crystal violet strongly
C. Lose crystal violet and take up safranin ✅✅✅
D. Have no cell wall
14. The external slimy layer that helps bacteria attach to surfaces is the:
A. Capsule ✅✅✅
B. Flagellum
C. Ribosome
D. Plasmid
15. Which bacterial structure is mainly responsible for motility?
A. Pili
B. Capsule
C. Flagellum ✅✅✅
D. Endospore
16. Pili are mainly used for:
A. Energy production
B. Attachment and conjugation ✅✅✅
C. Photosynthesis
D. Protein synthesis
