BIOL 235 MIDTERM 1 - Version B Guide Athabasca University COMPLETE SOLUTION

MIDTERM 1- VERSION B 1. Know components of the lipid bi-layer o The basic structural framework of the plasma membrane is the lipid bilayer, two back-to-back layers made up of three types of lipid molecules—phospholipids, cholesterol, and glycolipids o The bilayer arrangement occurs because the lipids are amphipathic molecules, which means that they have both polar and nonpolar parts. 2. Bonds between water molecules- what type of bond is it? o Polar covalent/hydrogen bond 3. Facilitated diffusion and what role does carrier protein play o Carrier proteins transport substances across membranes by changing shape 4. Know Transcytosis o Active process of moving substances across a cell using vesicles, most often across endothelial cells lining blood vessels 5. Is a synovial membrane considered an epithelial membrane? o No, it is not 6. Know what role triglycerides and cholesterol plays in body o Triglycerides: protection, insulation, energy storage o Cholesterol: in bile salts, vit D and steroid hormones, important for steroid synthesis ,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,CONTINUED