The first step of chymotrypsins mechanism is shown below.

A.please fill in the remaining steps of the mechanism. Please include arrows for each step to indicate clearly what is happening in each part of the mechanism.

B. What amino acids do trypsin and chymotrypsin cut at?

C. How does the enzyme know to cut there?

D. Propose an alternative for aspartate and histidine in the catalytic triad. Draw out this interaction.