What is the role of glu 270 and arg 145 in catalysis?

Glu 270 as a GBC (general base catalyst) in step one and as a GAC (general acid catalyst) in step two. Arg 145 provides specific ion-ion interactions with the C-terminal carboxylate of the substrate which confers specificity for cleavage of the C-terminal residue from the peptide substrate

What are the answers

If these are the missing choices: a. to determine skin temperature, place the back of your hand against the patient's skin.b. determine body temperature by touching the patient's hands and feet.c. skin temperature will tell you very little about this patient's condition or well-being.d. the patient's skin temperature and color will likely be warm and red.my answer is: a. to determine skin temperature, place the back of your hand against the patient's skin. using the back of the hand to check for temperature rather than the palm is more effective because the back of the hand has more nerves that can feel and transmit the temperature than the palm.