Biology Definitions 0.0 / 5 ? BiologyAllInternational BaccalaureateOCR Created by: issygCreated on: 13-02-14 12:57 Evolution the cumulative change in the heritable characteristics of a population 1 of 14 Simple Diffusion the passive movement of molecules from a high concentration to a low concentration 2 of 14 Facilitated Diffusion diffusion involving channel proteins embedded in the membrane 3 of 14 Osmosis the passive movement of water molecules across a partially-permeable membrane from a high concentration to a low concentration 4 of 14 Active Transport the active movement of molecules using protein pumps embedded in the membrane from a low concentration to a high concentration 5 of 14 Enzyme globular protein which acts as a catalyst for biochemical reactions 6 of 14 Active site region on an enzyme's surface to which substrates can bind 7 of 14 Denaturation a structural change in a protein that results in the loss of its function 8 of 14 Cell Respiration the controlled release of energy from organic compounds in cells to form ATP 9 of 14 Substrate-level Phosphorylation a single reaction involving the direct transfer of a phosphate group from a donor molecule to ADP 10 of 14 Oxidative Phosphorylation a series of oxidation reactions that produce sufficient energy to form ATP from ADP and phosphate 11 of 14 Chemiosmosis the diffusion of ions across a selectively-permeable membrane down a solute potential gradient 12 of 14 Pathogen an organism or virus that causes a disease 13 of 14 Antigen a foreign substance which stimulates the production of antibodies 14 of 14
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