[BISC 1000] - Final Exam Guide - Everything you need to know! (52 pages long)

• School: Fordham University
• Department: Biological Sciences
• Course: BISC 1000
• Professor: Jacqui Johnson

Document Summary

Chapter 7 10 & 12 bio review. Plasma membrane: boundary that separates living cell from surroundings. Has selective permeability: allows some substances to pass through more easily. Fluid mosaic model: membrane is a fluid structure with mosaic of proteins. Phospholipids in plasma membrane can move within bilayer. Most lipids/some proteins drift laterally: transverse flip-flopping is v rare. Membranes must be fluid to work properly i. e. salad oil. As temperature goes down membranes switch from fluid to solid. Rich in unsaturated fats = more fluid than saturated fats. Steroid cholesterol has different effects on membrane fluidity at different temperatures: warm temperatures (i. e. 37 c) cholesterol restrains movement of phospholipids, cool temperatures maintain fluidity by preventing tight packing. Variations in lipid composition of cell membrane appear to be adaptations to specific environmental conditions. Ability to change in response to temperature has evolved in organisms that live where temperature varies.