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5 Written questions

5 Matching questions

  1. fluid mosaic
  2. coenzyme
  3. endocytosis
  4. noncompetitive inhibitor
  5. enzyme
  1. 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.
  2. 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.
  3. c Cellular uptake of molecules or particles via formation of new vesicles from the plasma membrane.
  4. 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.
  5. e An organic molecule serving as a cofactor. Most vitamins function as coenzymes in important metabolic reactions.

5 Multiple choice questions

  1. The principle of conservation of energy. Energy can be transferred and transformed, but it cannot be created or destroyed.
  2. The movement of materials out of the cytoplasm of a cell by the fusion of vesicles with the plasma membrane.
  3. Main energy source for cells.
  4. The energy of motion; the energy of a mass of matter that is moving. Moving matter does work by imparting motion to other matter.
  5. 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

  1. induced fitThe 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.

          

  2. pinocytosisCellular "drinking"; a type of endocytosis in which the cell takes fluid and dissolved solutes into small membranous vesicles.

          

  3. hypotonic solutionReferring to a solution that, when surrounding a cell, will cause the cell to take up water.

          

  4. passive transportThe 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).

          

  5. cellular respirationA method of metabolic control in which a product of a metabolic pathway acts as an inhibitor of an enzyme within that pathway.

          

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