Match List - I with List - II and select the correct answer using the code given below the lists:
List - I
A. Corynebacterium diphtheriae
B. Vibrio
C. Staphylococcus aureus
D. Yersinia

List - II

1. Comma shaped
2. Safety pin appearance
3. Grape like cluster
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 classic microscopic morphology, which is a key step in microbiological identification.
• Corynebacterium diphtheriae is known for its angular 'Chinese letter' arrangement (A-4).
• Vibrio species are characteristically comma-shaped (B-1).
• Staphylococcus aureus forms distinctive grape-like clusters (C-3).
• Yersinia pestis exhibits bipolar staining, giving it a 'safety pin' appearance (D-2).

Why Other Options Were Wrong

• Option A: This option incorrectly matches Corynebacterium with comma shape (A-1) and Vibrio with safety pin appearance (B-2). Vibrio is comma-shaped, and Yersinia has a safety pin appearance.
• Option B: This option incorrectly pairs Vibrio with grape-like clusters (B-3) and Staphylococcus with safety pin appearance (C-2). Staphylococcus forms grape-like clusters, and Yersinia has a safety pin appearance.
• Option D: This option incorrectly matches Corynebacterium with grape-like clusters (A-3) and Staphylococcus with comma shape (C-1). Staphylococcus forms grape-like clusters, and Vibrio is comma-shaped.

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 Identification as background academic context rather than a clinical decision trigger.
• A nurse's understanding of bacterial morphology is vital for interpreting preliminary lab reports (e.g., Gram stain results) from the microbiology department.
• Early identification based on morphology allows for prompt initiation of appropriate empirical antibiotic therapy and infection control measures (e.g., droplet precautions for diphtheria) before definitive culture results are available.
• What if? If a preliminary report on a sputum sample mentions 'Gram-positive cocci in clusters,' the nurse should anticipate a potential Staphylococcus infection and prepare for contact precautions and possible administration of anti-staphylococcal antibiotics, pending physician orders.

How to Approach the Question

• First, identify the question type. This is a 'Match the Following' question requiring knowledge of specific facts.
• Scan both lists to see if you can make any immediate, confident matches. For example, 'Staphylococcus' and 'grape-like clusters' is a very common association.
• Match the items you are certain about first. For instance, if you know B matches with 1 and C matches with 3, look for options that contain 'B-1' and 'C-3'.
• Use the process of elimination. If you find a match that contradicts an option, you can rule that entire option out.
• Continue matching the remaining items. The unique 'Chinese letter' arrangement of Corynebacterium and 'safety pin' of Yersinia are also classic identifiers.
• Once you have matched all pairs (A-4, B-1, C-3, D-2), select the option that reflects this complete set of correct matches.

Concept Tested & Keywords

• Concept Tested: Bacterial Morphology and Identification
• Stem keywords: Corynebacterium diphtheriae, Vibrio, Staphylococcus aureus, Yersinia, microscopic appearance
• Lead-in keywords: Match List - I with List - II
• Negative lead-in flag: false

Question ID

QBMJI0eQpNQYJjukrb4CUe

Copy ID

Reference Book

E6 Microbiology Applied AnjuDhir 3e Part 1 p. 54-56