5 Written questions
5 Matching questions
- fluid mosaic
- noncompetitive inhibitor
- a A protein (or RNA molecule) that serves as a biological catalyst, changing the rate of a chemical reaction without itself being changed into a different molecule in the process.
- b A substance that impedes the activity of an enzyme without entering an active site. By binding elsewhere on the enzyme, a noncompetitive inhibitor changes the shape of the enzyme so that the active site no longer functions.
- c Cellular uptake of molecules or particles via formation of new vesicles from the plasma membrane.
- d 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.
- e An organic molecule serving as a cofactor. Most vitamins function as coenzymes in important metabolic reactions.
5 Multiple choice questions
- 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.
- Main energy source for cells.
- The energy of motion; the energy of a mass of matter that is moving. Moving matter does work by imparting motion to other matter.
- A method of metabolic control in which a product of a metabolic pathway acts as an inhibitor of an enzyme within that pathway.
5 True/False questions
induced fit → 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.
pinocytosis → Cellular "drinking"; a type of endocytosis in which the cell takes fluid and dissolved solutes into small membranous vesicles.
hypotonic solution → Referring to a solution that, when surrounding a cell, will cause the cell to take up water.
passive transport → The movement of a substance across a biological membrane against its concentration gradient, aided by specific transport proteins and requiring input of energy (often as ATP).
cellular respiration → A method of metabolic control in which a product of a metabolic pathway acts as an inhibitor of an enzyme within that pathway.