Select the 4 choices that are correct about pepsin.
1) Hormones are needed for any pepsin to be available in the stomach.
2) Pepsin digests carbohydrates.
3) Pepsinogen is the inactive form of pepsin.
4) This enzyme is produced in inactive form by cells in gastric glands.
5) Pepsin is always available but only active in the presence of hydrochloric acid.
6) Pepsin is found embedded in the apical membrane of surface epithelium cells of the stomach.
7) Pepsin breaks down proteins.
8) Pepsin would damage the stomach if it was active in the stomach all the time.