Your bacterium is growing on a type of medium called casein agar, which contains milk protein (casein). There is a clear zone around the growth area of the bacterium, showing that it is synthesizing the enzymes needed to catalyze the breakdown of casein. These enzymes are considered ______.

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The clear zone around the growth area indicates that the bacterium is secreting enzymes that break down casein outside of the cell. These enzymes are called exoenzymes because they function outside the cell to digest large molecules into smaller compounds that the bacterium can then absorb.

Your Bacterium Is Growing on a Type of Medium Called