When sodium chloride (NaCl) moves across a cell membrane, it typically travels through a protein channel and moves from high concentration to low concentration. Compared to the models of protein transport, which model best matches this description and why is a protein channel necessary?

the answer for sodium is 0.186

the answer for rubidium is 0.251

1. they vary with a higher number because boiling is way hotter than melting

chemical digestion occurs in the stomach were hcl and pepsin forms chyme, the mouth in which salivary amylase breaks down starch to form bolus, and the small intestine specifically the duodenum.