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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Quizplus · Accepted Answer

The clear zone around the growth area of the bacterium indicates that it is secreting enzymes that break down casein, which are exoenzymes. Apoenzymes are inactive without a cofactor, ribozymes are RNA molecules that catalyze reactions, regulated enzymes are controlled by signals from the cell, and endoenzymes catalyze reactions within the cell itself. None of these descriptions fit the situation described in the question.

Your Bacterium Is Growing on a Type of Medium Called