MCQ Bank
The number of colonies on a spread plate after incubation indicate?
- A) Cells can only be counted with microscope
- B) Bacterial Lawn
- C) Viable cell count
- D) Dead cell count
Which solution is used as a moderant in Gram staining?
- A) Sefranine
- B) Ethanol
- C) Crystal Violet
- D) Iodine
Which test in the IMViC series is primarily used to detect the presence of acetoin?
- A) Citrate utilization test
- B) Indole test
- C) Voges-Proskauer test
- D) Methyl red test
At which phase the growth rate of bacteria is exactly equal to the death rate?
- A) Stationary Phase
- B) Log Phase
- C) Death Phase
- D) Lag Phase
What is the significance of the Oxidase test?
- A) Determine carbohydrate utilization
- B) Differentiate between aerobic and anaerobic bacteria
- C) To Measure pH change
- D) Assessing antibiotic resistance
Why are CFU counts considered a more accurate measure of bacterial viability than direct cell counts?
- A) They determine bacterial species diversity
- B) They provide information about bacterial morphology
- C) They indicate bacterial concentration
- D) They differentiate between live and dead cells
Why understanding bacterial growth kinetics is crucial in microbiology?
- A) To estimate bacterial age
- B) To determine bacterial habitat
- C) To predict population growth in food spoilage
- D) To optimize antibiotic dosages
Why is it necessary to use iodine in Gram staining?
- A) To stabelize sefranine
- B) To fix smear
- C) To form a complex with crystal violet
- D) To remove excess dye
Which test determines the ability of bacteria to use specific carbohydrates?
- A) Fermentation test
- B) Oxidase test
- C) Urease test
- D) Catalase test
A clear zone of microbial growth arround an anti-microbial substance indicate?
- A) Resistance
- B) Tolerance
- C) Suseptibility
- D) Increased growth
For bacterial cell count, what is the acceptable number of bacterial colonies on a spread plate?
- A) < 20
- B) 30-200
- C) > 300
- D) >400