Answer the following question given this paragraph: 

Bradykinin is a peptide hormone composed of nine amino acids that lowers blood pressure. Its primary structure is arg-pro-pro-gly-phe-ser-pro-phe-arg. Would you expect bradykinin to be positively charged, negatively charged, or neutral at a pH of 6.0? Justify your answer.


Q: What do we call a peptide hormone composed of nine amino acids that lowers blood pressure?

 Choices:

- angiotensin

- parcnid

- bufotenin

- bradykinin

A:
bradykinin
