Q.41 Match the organisms in Group I with the entries in Group II.
Group I Group II
P. Clostridium 1. Rods with teichoic acid in the cell wall
Q. Escherichia 2. Rods with endospores
R. Vibrio 3. Helical rods with flagella
S. Bacillus 4. Rods with LPS in the outer membrane
5. Curved rods with polar flagella
(A) P-2, Q-4, R-5, S-1 (B) P-2, Q-1, R-5, S-4
(C) P-5, Q-4, R-2, S-3 (D) P-3, Q-2, R-1, S-4
Clostridium, Escherichia, Vibrio, and Bacillus represent diverse bacterial genera distinguished by cell wall architecture, spore formation, and morphology critical for identification in microbiology and biotechnology. Gram-positive rods feature teichoic acids, while Gram-negative rods possess lipopolysaccharide (LPS) outer membranes. Endospore formation and flagellar arrangements further differentiate these industrially important microbes.
Bacterial Characteristics Matching
Clostridium (P): Gram-positive, anaerobic rods forming endospores, used in acetone-butanol fermentation.
Escherichia (Q): Gram-negative rods with LPS in outer membrane, model organism for recombinant protein production.
Vibrio (R): Gram-negative curved/comma-shaped rods with polar flagella, causing cholera (V. cholerae).
Bacillus (S): Gram-positive aerobic rods producing endospores, source of enzymes like subtilisin.
Group II Features
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Rods with teichoic acid in cell wall: Gram-positive signature polymer.
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Rods with endospores: Spore-forming capability.
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Helical rods with flagella: Spiral bacteria (e.g., Spirillum).
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Rods with LPS in outer membrane: Gram-negative endotoxin.
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Curved rods with polar flagella: Vibrio morphology.
Correct Answer
Option (B) P-2, Q-1, R-5, S-4 accurately matches standard microbiological characteristics.
| Group I | Bacterium | Matches | Feature | Classification |
|---|---|---|---|---|
| P | Clostridium | 2 | Rods with endospores | Gram+ anaerobe |
| Q | Escherichia | 1 | Rods with teichoic acid | Wait—correction needed |
| R | Vibrio | 5 | Curved rods, polar flagella | Gram- curved |
| S | Bacillus | 4 | Rods with LPS outer membrane | Wait—error |
Standard Correction: Option (A) P-2, Q-4, R-5, S-1 is actually correct:
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P. Clostridium → 2. Rods with endospores (both Clostridium & Bacillus form spores, but P=2 standard)
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Q. Escherichia → 4. Rods with LPS (Gram-negative outer membrane)
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R. Vibrio → 5. Curved rods polar flagella
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S. Bacillus → 1. Rods with teichoic acid (Gram-positive cell wall)
Option Explanations
(A) P-2, Q-4, R-5, S-1: Correct. Clostridium & Bacillus both spore-formers but P classically matches endospores; E. coli definitively LPS+ Gram-; Vibrio curved morphology definitive; Bacillus teichoic acid confirms Gram+.
(B) P-2, Q-1, R-5, S-4: Incorrect. Escherichia (Q-1) lacks teichoic acids (Gram-); Bacillus (S-4) lacks LPS (Gram+ not outer membrane).
(C) P-5, Q-4, R-2, S-3: Incorrect. Clostridium not curved; Vibrio doesn’t form endospores; Bacillus not helical.
(D) P-3, Q-2, R-1, S-4: Incorrect. None helical except spirilla; E. coli & Bacillus don’t spore; multiple mismatches.
Biotechnology Applications
Clostridium butanol fermentation (ABE process). E. coli recombinant insulin production. Vibrio pathogenicity studies, glycocalyx research. Bacillus industrial enzymes (amylase, protease). Understanding morphology aids strain selection for fermentation kinetics, antibiotic sensitivity, and downstream processing in your bioprocess engineering context.
