click below
click below
Normal Size Small Size show me how
Biology Exam Review
Term | Definition |
---|---|
Activation Energy | the quantity of energy required for a reaction to occur. |
Active Site | the region on an enzyme to which the substrate or substrates bind. |
Active Transport | movement across a semi-permeable membrane that requires energy output from the cell. |
Acid | is a chemical species that donates protons or hydrogen ions or accepts electrons. |
Aerobic | requiring air or oxygen for life or survival. |
Anaerobic | not requiring air or oxygen for life or survival. |
Atom | the smallest possible particle of an element that retains all the characteristics of the element. |
ATP | the molecule that cells use for energy. |
Base | a substance that increases OH- concentration when added to water. |
Carbohydrates | a substance composed of carbon, hydrogen, and oxygen atoms that includes monosaccharide, disaccharide and polysaccharide. |
Catalyst | a substance that increases the rate of chemical reaction without itself being changed in the reaction. |
Cell | the smallest unit of life that can function independently. |
Cellular Respiration | the process of the cell making it's own energy. |
Compound | a pure substance made up of 2 or more chemically combined elements. |
Concentration | the amount of a substance in a given volume. |
Covalent Bond | the chemical bond that forms when 2 atoms share electrons. |
Denaturization | occurs when the shape of a protein is changed so much that it cannot perform it's function. |
Diffusion | the movement of molecules from an area of higher concentration to an area of lower concentration. |
Electrolyte | a liquid or gel that contains ions and can be decomposed by electrolysis, the ionized or ion-able constituents of a living cell, blood, or other organic matter. |
Electron | a stable subatomic particle with a charge of negative electricity, found in all atoms and acting as the primary carrier of electricity in solids. |
Element | a pure substance that cannot be broken down by chemical means into other substances. |
Endocytosis | a process that transports larger substances into the cell; the cell membrane folds around the substance to be absorbed and pinched off, forming a vesicle or vacuole. |
Enzyme | a protein that acts as a biological catalyst, increasing the speed at which chemical reactions in the body occur. |
Exocytosis | a process that transports substances out of the cell; a vesicle containing substances to be removed fuses with the cell membrane and the substances are released. |
Facilitated Diffusion | a form of diffusion across a semi-permeable membrane in which substances are transported through the membrane with the help of proteins; does not require energy from the cell. |
Fermentation | a chemical process that makes ATP without oxygen. |
Glycolysis | the first step of aerobic cellular respiration in which a glucose molecule splits into two three-carbon molecules called pyruvate. |
Hydrophillic |