LIFESCI 2 Chapter Notes - Chapter 5 and 9: Lipid Bilayer, Gap Junction, Membrane Transport Protein
Document Summary
Cells communicate and are well anchored to each other. Cells are surrounded by interstitial fluid bathing them: maintaining constant concentrations of energy-rich molecules, oxygen, carbon dioxide, waste products, ph, water, salt, other electrolytes, and temperature. A hundred trillion plus cells make up our body: two hundred different cells, cells all have different functions. Dna in all cells is identical; however, the coded areas differ. Plasma membrane is known as the fluid mosaic model: all biological membranes contain proteins, many membrane proteins have hydrophilic and hydrophobic regions, the association of protein molecules with lipid molecules is not covalent, membrane composition and structure. Some cells have carbohydrates associated with their external surfaces. Most of the carbohydrate in the membrane is covalently bonded to proteins, forming glycoproteins. Two types of proteins may be in the membrane. Junctions: proteins that allow interaction between directly neighboring cell, three types. A lot of these junctions in skin cells and muscle cells.
