Question

In a casein agar test, a bacterial species grows well on the agar, and creates a clear zone around its colonies. This bacterium must be: NEG POS Select one: a. releasing proteinase enzymes into its surroundings. b. oxidase enzyme positive as well. C. utilizing citrate as its main source of carbohydrate. d. able to turn SIM agar to black in color.

Answer 1

Option (a) is the correct answer...

Releasing proteinase enzymes into its surroundings.because

Casein Agar it is the  skim milk agar defined to the growth medium using for the detection of the hydrolytic microorganisms.

There was  microorganism have to ability of degrades the casein by produced proteolytic exoenzyme, its called as proteinase or (caseinase) its  breaks to the peptide bond of CO-NH by introduced H2O into the molecule, generating the smallest chains of proteins called as peptides, it is break down into the free amino acids by extracellular / intracellular proteinases.  

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