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Biology Terms

Over Unit D, E,F

TermDefinition
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