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5 Written questions

5 Matching questions

  1. phosphorylation
  2. potential energy
  3. endocytosis
  4. exocytosis
  5. tonicity
  1. a The movement of materials out of the cytoplasm of a cell by the fusion of vesicles with the plasma membrane.
  2. b The energy that matter possesses because of its location or arrangement. Water behind a dam and chemical bonds possess potential energy.
  3. c The ability of a solution surrounding a cell to cause that cell to gain or lose water.
  4. d Cellular uptake of molecules or particles via formation of new vesicles from the plasma membrane.
  5. e The transfer of a phosphate group, usually from ATP, to a molecule. Nearly all cellular work depends on ATP energizing other molecules by phosphorylation.

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. An increase or decrease in the density of a chemical substance in an area. Cells often maintain concentration gradients of ions across their membranes. When a gradient exists, substances tend to move from where they are more concentrated to where they are less concentrated.
  3. The spontaneous tendency of a substance to move down its concentration gradient from where it is more concentrated to where it is less concentrated.
  4. An energy-requiring chemical reaction, which yields products with more potential energy than the reactants. The amount of energy stored in the products equals the difference between the potential energy in the reactants and that in the products.
  5. Main energy source for cells.

5 True/False questions

  1. induced fitCellular uptake of molecules or particles via formation of new vesicles from the plasma membrane.


  2. aquaporinA transport protein in the plasma membrane of some plant or animal cells that facilitates the diffusion of water across the membrane (osmosis).


  3. substrate(1) A specific substance (reactant) on which an enzyme acts. Each enzyme recognizes only the specific substrate or substrates of the reaction it catalyzes. (2) A surface in or on which an organism lives.


  4. energy couplingThe capacity to perform work, or to rearrange matter.


  5. 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).


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