Microbiology Lab Final Exam Questions
and Answers Already Passed
What is the primary function of the bacterial cell wall?
A) Energy production
B) Protein synthesis
C) Protection and shape maintenance
D) DNA replication
✔✔ C) Protection and shape maintenance
What is the purpose of the streak plate method in microbiology?
A) To test antibiotic susceptibility
B) To isolate individual bacterial colonies
C) To identify bacterial species
D) To perform a Gram stain
✔✔ B) To isolate individual bacterial colonies
What is the main function of the ribosome in a bacterial cell?
A) Cell division
1
,B) Protein synthesis
C) DNA storage
D) ATP production
✔✔ B) Protein synthesis
Which of the following is used to detect bacterial endospores?
A) Gram stain
B) Acid-fast stain
C) Endospore stain
D) Simple stain
✔✔ C) Endospore stain
Which of the following is true about Gram-positive bacteria?
A) They have a thin peptidoglycan layer
B) They retain the crystal violet stain
C) They have an outer membrane
D) They appear pink after a Gram stain
✔✔ B) They retain the crystal violet stain
2
,What is the primary purpose of the phenol red fermentation broth test?
A) To test for motility
B) To determine gas production during fermentation
C) To determine whether a bacterium can grow at high temperatures
D) To identify the presence of an endospore
✔✔ B) To determine gas production during fermentation
Which of the following is an example of a selective medium?
A) MacConkey agar
B) Nutrient agar
C) Sabouraud dextrose agar
D) Blood agar
✔✔ A) MacConkey agar
Which of the following is a feature of fungal cells that distinguishes them from bacterial cells?
A) Presence of a peptidoglycan cell wall
B) Presence of a nucleus
3
, C) Presence of ribosomes
D) Presence of a plasmid
✔✔ B) Presence of a nucleus
What is the term for a microorganism that lives in or on another organism and causes harm to the
host?
A) Commensal
B) Parasite
C) Mutualist
D) Autotroph
✔✔ B) Parasite
Which of the following is true about the Gram stain procedure?
A) The decolorizer in the Gram stain is alcohol or acetone
B) Gram-negative bacteria appear purple
C) The counterstain used is crystal violet
D) The primary stain used is safranin
✔✔ A) The decolorizer in the Gram stain is alcohol or acetone
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and Answers Already Passed
What is the primary function of the bacterial cell wall?
A) Energy production
B) Protein synthesis
C) Protection and shape maintenance
D) DNA replication
✔✔ C) Protection and shape maintenance
What is the purpose of the streak plate method in microbiology?
A) To test antibiotic susceptibility
B) To isolate individual bacterial colonies
C) To identify bacterial species
D) To perform a Gram stain
✔✔ B) To isolate individual bacterial colonies
What is the main function of the ribosome in a bacterial cell?
A) Cell division
1
,B) Protein synthesis
C) DNA storage
D) ATP production
✔✔ B) Protein synthesis
Which of the following is used to detect bacterial endospores?
A) Gram stain
B) Acid-fast stain
C) Endospore stain
D) Simple stain
✔✔ C) Endospore stain
Which of the following is true about Gram-positive bacteria?
A) They have a thin peptidoglycan layer
B) They retain the crystal violet stain
C) They have an outer membrane
D) They appear pink after a Gram stain
✔✔ B) They retain the crystal violet stain
2
,What is the primary purpose of the phenol red fermentation broth test?
A) To test for motility
B) To determine gas production during fermentation
C) To determine whether a bacterium can grow at high temperatures
D) To identify the presence of an endospore
✔✔ B) To determine gas production during fermentation
Which of the following is an example of a selective medium?
A) MacConkey agar
B) Nutrient agar
C) Sabouraud dextrose agar
D) Blood agar
✔✔ A) MacConkey agar
Which of the following is a feature of fungal cells that distinguishes them from bacterial cells?
A) Presence of a peptidoglycan cell wall
B) Presence of a nucleus
3
, C) Presence of ribosomes
D) Presence of a plasmid
✔✔ B) Presence of a nucleus
What is the term for a microorganism that lives in or on another organism and causes harm to the
host?
A) Commensal
B) Parasite
C) Mutualist
D) Autotroph
✔✔ B) Parasite
Which of the following is true about the Gram stain procedure?
A) The decolorizer in the Gram stain is alcohol or acetone
B) Gram-negative bacteria appear purple
C) The counterstain used is crystal violet
D) The primary stain used is safranin
✔✔ A) The decolorizer in the Gram stain is alcohol or acetone
4
