5 Written Questions
5 Matching Questions
- exergonic reaction
- induced fit
- fluid mosaic
- energy coupling
- a An energy-releasing chemical reaction in which the reactants contain more potential energy than the products. The reaction releases an amount of energy equal to the difference in potential energy between the reactants and the products.
- b A description of membrane structure, depicting a cellular membrane as a mosaic of diverse protein molecules embedded in a fluid bilayer made of phospholipid molecules.
- c In cellular metabolism, the use of energy released from an exergonic reaction to drive an endergonic reaction.
- d The change in shape of the active site of an enzyme, induced by entry of the substrate so that it binds more snugly to the substrate.
- e The spontaneous tendency of a substance to move down its concentration gradient from where it is more concentrated to where it is less concentrated.
5 Multiple Choice Questions
- A nonprotein molecule or ion that is required for the proper functioning of an enzyme. See also coenzyme.
- The transfer of a phosphate group, usually from ATP, to a molecule. Nearly all cellular work depends on ATP energizing other molecules by phosphorylation.
- The principle of conservation of energy. Energy can be transferred and transformed, but it cannot be created or destroyed.
- The movement of materials out of the cytoplasm of a cell by the fusion of vesicles with the plasma membrane.
- The diffusion of a substance across a biological membrane, without any input of energy.
5 True/False Questions
chemical energy → Energy available in molecules for release in a chemical reaction; a form of potential energy.
substrate → A measure of disorder. One form of disorder is heat, which is random molecular motion.
second law of thermodynamics → The principle of conservation of energy. Energy can be transferred and transformed, but it cannot be created or destroyed.
active site → An organic molecule serving as a cofactor. Most vitamins function as coenzymes in important metabolic reactions.
concentration gradient → The energy that matter possesses because of its location or arrangement. Water behind a dam and chemical bonds possess potential energy.