Question

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(1 pt 27) The two bacteria cultured on this mannitol salt agar plate will have the same reaction. One reacted nearly 24 hours before the other. What substance in the agar was catabolized by both bacteria that produced the demonstrated colorimetric change? Image gallery (click for full size) (1pt 28) The presence of bacterial growth on this mannitol salt agar plate suggests that these bacteria can tolerate the hyperosmotic condition produced by the salt. The term used to collectively describe microbes that can tolerate such high salt concentrations in their environment is Image gallery (click for full size)

Answer 1

Ans-27- If mannitol is fermented it produces acid which reacts with phenol red indicator to produce yellow color and if not fermented then the medium remains red. So this is mannitol which is getting metabolized.

Ans-28- Halophiles is the term used to describe the bacteria which can tolrate and grow at high salt concentration.