Question

copyright © mcgraw hill llc. permission required for reproduction or display. fill in the blank question these colonies, growing on macconkey agar, are all gram blank bacteria.

Explanation:

MacConkey agar is a selective and differential medium used for the isolation of gram - negative enteric bacteria. It inhibits the growth of gram - positive bacteria. So, colonies growing on MacConkey agar are typically gram - negative bacteria.

Answer:

negative