Activation of pepsinogen starts when hydrocholoric acid (HCl), which is secreted by the parietal cells partially activates pepsinogen (pepsinogen* in figure). This partially active enzyme then cleaves the peptide from other pepsinogen molecules to form active pepsin.
Answer: All of the rock in the Earth is recycled and accounted for during the rock cycle. This principle applies to other areas of science as well and is known as conservation of mass, which says that mass cannot be created or destroyed but is cycled between different forms.
Explanation:
Answer:
meisosis I don't rember how to spell it lol. But I believe that it is the answer
Explanation:
The four macromolecules are nucleic acids, carbohydrates, proteins, and lipids.