Biology Key Words 5.0 / 5 based on 2 ratings ? BiologyKeywordsASEdexcel Created by: Suhana97Created on: 02-03-15 12:30 Cohesion Hydrogen Bonds occuring between water molecules. 1 of 15 Adehesion Hydrogen bonds occuring between water and other molecules. 2 of 15 Osmosis The net diffusion of water molecules through a semi-permeable membrane from a high concentration to a low concentration. 3 of 15 Diffusion The movement of single molecules from a high concentration gradient to a low concentration gradient. (NB - no energy from ATP required) 4 of 15 Active Transport The movement of molecules across a cell membrane from low concentration to high concentration, assisted by enzymes and requiring energy. 5 of 15 Carrier Proteins These move large molecules into or out of a cell, down a concentration gradient. 6 of 15 Channel Proteins These form pores in the membrane for charged particles to diffuse through, down a concentration gradient. 7 of 15 Glycosidic Bond The bond that is made between two glucose molecules, formed in a condensation reaction. 8 of 15 Triglyceride A lipid with one molecule of glycerol and 3 fatty acids. 9 of 15 Primary Structure of Protein The sequence of amino acids in the polypeptide chain, held together by peptide bonds. 10 of 15 Secondary Structure of Protein H-bonds form between amino acids in the chain, making the structure coil into an alpha helix or a beta pleated sheet. 11 of 15 Electrostatic Attraction Attraction between a slightly positive atom and a slightly negative atom of another molecule. 12 of 15 Dipole Separation of charge within a water molecule of slightly positive hydrogen atom and a slightly negative oxygen atom. 13 of 15 Surface Tension Property of liquids, behaving as if the surface is covered by a thin elastic layer. 14 of 15 Amphoteric Act as both an acid - forms H+ ions and is a proton acceptor and a base 15 of 15
Comments
No comments have yet been made