Which of the Following Statements About Trypsin, Chymotrypsin, and Elastase

Multiple Choice

Which of the following statements about trypsin, chymotrypsin, and elastase are true?

A) They are serine proteases.
B) They are endopeptidases.
C) Serine is part of both tetrahedral intermediates in the enzymatic mechanism.
D) Acid, base, and nucleophilic catalysis are utilized in the overall mechanism for these proteases.
E) All of the above are true.