What is common among amylase, rennin and trypsin ?

What is common among amylase, rennin and trypsin ?

Q. What is common among amylase, rennin and trypsin ?

A.            These ast as a pH lower than 7

B.            These are produced in stomach

C.            These all are proteolytic enzymes

D.            These all are proteins

Answer: These all are proteins

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