LIFESCI 23L Study Guide - Final Guide: Phospholipid, Red Blood Cell, Cotransporter
Document Summary
The beaker in the illustration below contains two solutions of salt with different concentrations (measured by molarity, m). The two solutions are separated by a membrane that is permeable to both salt and water. Net diffusion of water across the membrane, but not of salt. Net diffusion of water from a to b and of salt from b to a. Diffusion of salt across the membrane, but not of water. Net diffusion of salt from b to a, but no net diffusion of water. The cytoplasmic phospholipid is too big to pass through the membrane. The polar head group cannot pass through the nonpolar interior. The two sides have different functions and thus the phospholipid would not function properly. The cholesterol does not allow lipids to move: in the figure below, the cell is _____ to the solution. Phospholipase is an enzyme that cleaves the phosphate head group off a phospholipid molecule.
