Match List – I with List – II and select the correct answer using the code given below the lists:

List – I	List – II
A. Corynebacterium diphtheriae	1. Comma shaped
B. Vibrio	2. Safety pin appearance
C. Staphylococcus aureus	3. Grape like cluster
D. Yersinia	4. Chinese letter arrangement

1. A

   A-1, B-2, C-3, D-4

2. B

   A-4, B-3, C-2, D-1

3. C

   A-4, B-1, C-3, D-2

4. D

   A-3, B-2, C-1, D-4

Appeared in: UPPSC 2022

Explanation

• The correct option correctly pairs each bacterium with its characteristic microscopic appearance.
• Corynebacterium diphtheriae bacilli arrange themselves at angles, resembling Chinese letters (A-4).
• Vibrio bacteria are curved rods, giving them a comma-like shape (B-1).
• Staphylococcus aureus cocci divide and clump together in formations resembling grape-like clusters (C-3).
• Yersinia pestis bacilli exhibit bipolar staining, which creates a distinctive safety pin appearance (D-2).

Why Other Options Were Wrong

• Option A: This option incorrectly matches Corynebacterium with comma shape (A-1), Vibrio with safety pin (B-2), and Yersinia with Chinese letters (D-4).
• Option B: This option incorrectly matches Vibrio with grape-like clusters (B-3), Staphylococcus with safety pin (C-2), and Yersinia with comma shape (D-1).
• Option D: This option incorrectly matches Corynebacterium with grape-like clusters (A-3), Staphylococcus with comma shape (C-1), and Yersinia with Chinese letters (D-4).

Related Visual

Clinical Relevance

• Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Bacterial morphology and microscopic arrangement as background academic context rather than a clinical decision trigger.
• Identifying bacterial morphology via Gram stain is one of the fastest and most important initial steps in the microbiology lab for diagnosing bacterial infections.
• The initial report of 'Gram-positive cocci in clusters' or 'Gram-negative comma-shaped rods' gives the clinician a strong clue to the likely pathogen (e.g., Staphylococcus or Vibrio) and helps guide the choice of empiric antibiotics while waiting for culture results.
• What if? If a Gram stain from a sputum sample showed Gram-positive lancet-shaped diplococci instead of grape-like clusters, the likely pathogen would shift from Staphylococcus aureus to Streptococcus pneumoniae, requiring a different antibiotic consideration.

How to Approach the Question

• This is a 'Match the Following' question. The goal is to pair each item in List-I with the correct item in List-II.
• Start by identifying the pairs you are most confident about. For example, 'Staphylococcus' is well-known for its 'grape-like cluster' appearance (C-3).
• Look at the options. Any option that does not have the C-3 pairing can be eliminated. In this case, options B and D are eliminated.
• Next, consider another pair. 'Vibrio' is classically 'comma-shaped' (B-1). Check the remaining options (A and C) for this pair.
• Option C contains the pair B-1. Option A does not. Therefore, Option C must be the correct answer.
• Confirm the remaining pairs (A-4 and D-2) to ensure the entire combination is correct before finalizing your answer.

Concept Tested & Keywords

• Concept Tested: Bacterial morphology and microscopic arrangement
• Stem keywords: Corynebacterium diphtheriae, Vibrio, Staphylococcus aureus, Yersinia, Match List
• Lead-in keywords: select the correct answer
• Negative lead-in flag: false

Question ID

QKNi8oeQ7ahPVFemzhybIR

Copy ID

Reference Book

E6 Microbiology Applied AnjuDhir 3e Part 1 pp. 54-56, 53-55