Q.79 Match the media in Group I for screening microbial isolates in Group II.
| Group I |
|---|
| (P) Blood agar media (Q) Minimal media (R) Skimmed milk agar media (S) Bile salt media |
| Group II |
|---|
| (i) Coliforms (ii) Protease producers (iii) Hemolytic microbes (iv) Lipase producers (v) Autotrophs |
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Screening Microbial Isolates Media Matching: Solved MCQ with Full Explanation
In microbiology and biotechnology exams like NEET PG, CSIR NET, or GATE, screening microbial isolates media matching questions test your knowledge of selective and differential media. These help identify specific microbial traits, such as enzyme production or metabolic capabilities. This article breaks down Question 79, reveals the correct answer, and explains every option with real-world applications.
Correct Answer: Option (A) – P-iii, Q-v, R-ii, S-i
Why is (A) correct? This matching perfectly aligns each medium’s selective/differential properties with the microbial trait:
| Medium (Group I) | Matches (Group II) | Reason |
|---|---|---|
| (P) Blood agar | (iii) Hemolytic microbes | Blood agar shows hemolysis zones (alpha, beta, gamma) around colonies, screening for microbes like Streptococcus that lyse RBCs. |
| (Q) Minimal media | (v) Autotrophs | Contains only basics (e.g., salts, glucose); autotrophs grow by fixing CO₂, while others fail without organic supplements. |
| (R) Skimmed milk agar | (ii) Protease producers | Proteases hydrolyze casein, creating clear zones around colonies (e.g., Bacillus subtilis). |
| (S) Bile salt media | (i) Coliforms | Bile salts inhibit Gram+ bacteria; coliforms (E. coli) grow, used in water quality tests like MacConkey agar variants. |
This is standard in microbial screening protocols for biotech and microbiology labs.
Why Other Options Are Incorrect: Detailed Breakdown
Understanding wrong matches helps in screening microbial isolates media matching for exams. Here’s why B, C, and D fail:
Option (B): P-iii, Q-ii, R-i, S-iv
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Correct: P-iii (hemolytic).
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Wrong:
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Q-ii: Minimal media doesn’t screen proteases; it’s for auxotrophy/autotrophy.
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R-i: Skimmed milk isn’t for coliforms (no bile salts).
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S-iv: Bile salts don’t detect lipases (needs tributyrin agar).
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Option (C): P-i, Q-iii, R-ii, S-iv
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Correct: R-ii (protease).
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Wrong:
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P-i: Blood agar isn’t specific for coliforms (lacks bile salts).
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Q-iii: Minimal media doesn’t detect hemolysis.
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S-iv: Bile salt media skips lipase screening.
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Option (D): P-ii, Q-i, R-iv, S-v
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All wrong:
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P-ii: Blood agar ≠ protease (no milk proteins).
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Q-i: Minimal media ≠ coliforms (they need enriched nutrients).
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R-iv: Skimmed milk ≠ lipases (proteases, not fats).
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S-v: Bile salts ≠ autotrophs (not minimal composition).
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Quick Tips for Screening Media in Exams
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Differential media show reactions (e.g., zones of clearance).
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Selective media inhibit non-targets (e.g., bile salts).
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Practice with real isolates: Pseudomonas on milk agar for proteases, Nitrosomonas on minimal for autotrophs.
Mastering screening microbial isolates media matching boosts scores in molecular biology and microbiology sections. Share your exam experiences below!
