Revise MBBS

Paper I — 2024 August (Supplementary) (2010 Scheme) — Q5

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Paper I
2024 August (Supplementary) (2010 Scheme) · 40 marks · 120 min

Question

Selective media with TWO examples.

Q52 marksShort Notes

Answer

Selective media are culture media that contain agents (inhibitory substances, antibiotics, dyes, or altered pH/salt concentration) that suppress or inhibit the growth of unwanted/competing organisms while allowing the specific target organism(s) to grow — used to isolate a particular pathogen from a specimen that normally contains a mixture of commensal/other organisms.

Two examples:

  1. MacConkey agar — contains bile salts and crystal violet, inhibiting most Gram-positive organisms while allowing growth of Gram-negative enteric bacilli.
  2. Thayer-Martin/Modified Thayer-Martin medium — chocolate agar base with added antibiotics (vancomycin, colistin, nystatin, trimethoprim) to suppress commensal flora, selectively allowing growth of Neisseria gonorrhoeae.

(Other valid examples: TCBS agar for Vibrio cholerae; DCA/XLD agar for Salmonella/Shigella.)

  1. 1Culture Media and Methods

Other Years Asked

  1. 1Enrichment media with an example2014 September (Supplementary) (2010 Scheme)Short Note · 2 marks
  2. 2Anaerobic culture methods2021 May (Supplementary) (2010 Scheme)Short Note · 2 marks
  3. 3Enrichment medium.2016 February (2010 Scheme)Short Note · 2 marks
  4. 4Enrichment media.2020 February (Supplementary) (2010 Scheme)Short Note · 2 marks
  5. 5Enriched media2022 October (Supplementary) (2010 Scheme)Short Note · 2 marks
  6. 6Anaerobic culture methods2024 August (Supplementary) (2010 Scheme)Short Note · 2 marks
  7. 7Selective media with two examples.2023 March (Supplementary) (2010 Scheme)Short Note · 2 marks
  8. 8Robertson’s cooked meat medium2017 August (Supplementary) (2010 Scheme)Short Note · 2 marks
  9. 9Define Selective media with two examples2025 March (Supplementary) (2010 Scheme)Short Note · 2 marks
  10. 10Enrichment media.2013 April (2010 Scheme)Short Note · 2 marks
  11. 11Enriched media2018 February (2010 Scheme)Short Note · 2 marks
  12. 12Anaerobic culture methods.2017 February (2010 Scheme)Short Note · 2 marks
  13. 13Name TWO transport media.2024 March (Supplementary) (2019 Scheme)1 mark
  14. 14Which organism is identified by Nagler’s reaction.2023 January (Supplementary) (2019 Scheme)1 mark

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