Multiple choice

Which of the following mediums are selective for Gram-negative bacteria? P. Hektoen enteric agar Q. MacConkey agar R. Mannitol salt agar S. Yeast Malt Agar

  1. P and Q

  2. P and S

  3. Q and R

  4. Q and S

  5. R and S
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A Correct answer
Explanation

Hektoen Enteric Agar is a selective and differential agar for the isolation and cultivation of gram-negative enteric microorganisms, especially Salmonella and Shigella. MacConkey Agar is a selective and differential medium designed to isolate and differentiate Gram-negative enterics based on their ability to ferment lactose.

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