Bacte

What is the primary basis for the classification of clinically important bacteria?

• Colony morphology

• Antibiotic sensitivity

• Gram stain result

• Biochemical reactions

What color do Gram-positive bacteria appear when stained?

• Blue

• Purple

• Red

• Pink

Which of the following is a Gram-negative bacilli?

• Staphylococcus aureus

• Escherichia coli

• Streptococcus pneumoniae

• Bacillus anthracis

What type of bacteria are Acid Fast Bacilli (AFB) stained with?

• Lactophenol cotton blue

• Gram stain

• Ziehl-Neelsen stain

• Methylene blue

Which of the following is a characteristic of Gram-negative bacteria?

• Stain purple

• Thick peptidoglycan layer

• No outer membrane

• Outer membrane with lipopolysaccharides

Which organism is known for causing urinary tract infections and is a Gram-positive cocci?

• Staphylococcus saprophyticus

• Proteus mirabilis

• Escherichia coli

• Klebsiella pneumoniae

What is the shape of Gram-negative cocci?

• Spirilla

• Coccobacilli

• Cocci

• Bacilli

Which of the following is a common causative agent of pneumonia?

• Clostridium difficile

• Neisseria gonorrhoeae

• Haemophilus influenzae

• Streptococcus pyogenes

What type of media is used to culture Neisseria species?

• Blood Agar

• Thayer Martin agar

• MacConkey agar

• Chocolate agar

Which of the following is a Gram-positive bacilli?

• Pseudomonas aeruginosa

• Escherichia coli

• Salmonella enterica

• Corynebacterium diphtheriae