MLPAO Microbiology and Parasitology Fundamentals

Question 1

Which staining technique is used to classify bacteria as gram-positive or gram-negative?

Accepted Answer

Gram stain

Answer

Acid-fast stain

Answer

India ink stain

Answer

Giemsa stain

Question 2

Which selective and differential medium is used for the isolation of enteric gram-negative bacteria?

Accepted Answer

MacConkey agar

Answer

Blood agar

Answer

Chocolate agar

Answer

Mannitol salt agar

Question 3

What is the catalase test used for in microbiology?

Accepted Answer

Differentiating Staphylococcus (positive) from Streptococcus (negative)

Answer

Identifying gram-negative rods

Answer

Detecting spore-forming bacteria

Answer

Differentiating aerobic from anaerobic bacteria

Question 4

Which test differentiates Staphylococcus aureus from coagulase-negative staphylococci?

Accepted Answer

Coagulase test

Answer

Catalase test

Answer

Oxidase test

Answer

Bile esculin test

Question 5

What is the principle of the antimicrobial susceptibility test using the Kirby-Bauer disk diffusion method?

Accepted Answer

Measuring zones of growth inhibition around antibiotic-impregnated disks on agar

Answer

Measuring the minimum concentration of antibiotic that inhibits growth

Answer

Detecting antibiotic resistance genes by PCR

Answer

Measuring bacterial growth curves with and without antibiotics

Question 6

Which organism is the most common cause of community-acquired urinary tract infections?

Accepted Answer

Escherichia coli

Answer

Staphylococcus aureus

Answer

Pseudomonas aeruginosa

Answer

Enterococcus faecalis