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Biology Terms
Over Unit D, E,F
| Term | Definition |
|---|---|
| Multicellular organism | organisms that consist of more than one cell |
| Homeostasis | The maintenance of a relatively stable internal environment, even when the external environment changes. |
| Organ System | A set of cooperating organs within the body |
| Circulatory System | the system that circulates blood and lymph through the body, consisting of the heart, blood vessels, blood, lymph, and the lymphatic vessels and glands. |
| Feedback Mechanism | a process that uses the conditions of one component to regulate the function of the other |
| Stimulus | a thing or event that evokes a specific functional reaction in an organ or tissue. |
| Responce | A reaction, as that of an organism or a mechanism, to a specific stimulus |
| Hormone | A chemical signaling molecule that is released by a cell or gland and travels through the blood stream to exert an effect on target cells |
| Cell | The basic structural unit of living organisms |
| Cell Theory | The concept that all living organisms are made of cells and that cells are formed by the reproduction of existing cellsf |
| Prokaryotic | A usually unicellular organism whose cell lacks internal membrane bound organelles and whose DNA is not contained within a nucleus |
| Eukaryotic | Cells that contain membrane-bound organelles, including a central nucleus |
| Unicellular | consisting of a single cell. |
| Multicellular | having or consisting of many cells. |
| Organelle | The membrane bound compartments of eukaryotic cells that carry out specific functions |
| Plasma Membrane | A phospholipid bilayer with embedded proteins that forms the boundary of all cells |
| Chromosome | A single, large DNA molecule wrapped around portions. a |
| Cytoplasm | The gelatinous interior of all cells |
| Ribosome | A complex of RNA and proteins that carries out protein synthesis in all cells |
| Phospholipid | A type of liquid that forms the cell membrane |
| Transport Protein | proteins involved in the movement of ions, small molecules, or macromolecules, such as another protein, across a biological membrane |
| Surface Protein | are receptors at the surface of a cell (built into its cell membrane) that act in cell signaling by receiving (binding to) extracellular molecules. |
| Hydrophilic | Water loving |
| Hydrophobic | water fearing |
| Semi-permiable | allowing certain substances to pass through it but not others, especially allowing the passage of a solvent but not of certain solutes |
| Passive Transport | a movement of biochemicals and other atomic or molecular substances across cell membranes without need of energy input |
| Active Transport | The energy requiring process by which solutes are pumped from an area of high concentration to an area of low concentration with the help of transport proteins |
| Diffusion | The movement of dissolved substances from an area of high concentration to an area of low |
| Osmosis | The diffusion of water across a semipermeable membrane form an area of low concentration to an area of high concentration |
| Solution | The mixture of a solvent and a solute |
| Solvent | a substance in which other substances can be dissolved in |
| Solute | A dissolved substance |
| Intracellular | located or occurring within a cell or cells |
| Extracellular | situated or taking place outside a cell or cells. |
Created by:
ecpearce
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