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ATI RN · Microbiology · microbiology basic and clinical principles test bank

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Showing all 5 practice questions with expert explanatory rationales.

Question 1 of 5

A child with a persistent sore throat and fever had a smear from the throat revealing rod-shaped bacteria with dark blue polar granules. What is the likely causative agent?

A. Corynebacterium diphtheriae

B. Streptococcus pyogenes

C. Haemophilus influenzae

D. Klebsiella pneumoniae

Expert Explanatory Rationale

Correct Answer: Corynebacterium diphtheriae

Question 2 of 5

What is the structure of bacterial flagella?

A. 9+2 microtubule arrangement

B. protein filaments made of flagellin

C. lipid bilayer

D. peptidoglycan layer

Expert Explanatory Rationale

Correct Answer: protein filaments made of flagellin

Question 3 of 5

The most common bacterial species in hospital environment is:

A. Borrelia burgdorferi

B. Staphylococcus aureus

C. Bacillus cereus

D. Staphylococcus haemolyticus

Expert Explanatory Rationale

Correct Answer: Staphylococcus aureus

Question 4 of 5

A blood culture from a patient with sepsis revealed Gram-negative diplococci. The organism was oxidase-positive and fermentative. What is the most likely causative agent?

A. Neisseria gonorrhoeae

B. Neisseria meningitidis

C. Haemophilus influenzae

D. Moraxella catarrhalis

Expert Explanatory Rationale

Correct Answer: Neisseria meningitidis

Question 5 of 5

Which bacteria are capable of producing endospores?

A. Staphylococcus aureus

B. Clostridium botulinum

C. Escherichia coli

D. Neisseria gonorrhoeae

Expert Explanatory Rationale

Correct Answer: Clostridium botulinum

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