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5 Written questions

5 Matching questions

  1. noncompetitive inhibitor
  2. endocytosis
  3. competitive inhibitor
  4. active site
  5. passive transport
  1. a The part of an enzyme molecule where a substrate molecule attaches (by means of weak chemical bonds); typically, a pocket or groove on the enzyme's surface.
  2. b Cellular uptake of molecules or particles via formation of new vesicles from the plasma membrane.
  3. c The diffusion of a substance across a biological membrane, without any input of energy.
  4. d 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.
  5. e A substance that reduces the activity of an enzyme by binding to the enzyme's active site in place of the substrate. A competitive inhibitor's structure mimics that of the enzyme's substrate.

5 Multiple choice questions

  1. The transfer of a phosphate group, usually from ATP, to a molecule. Nearly all cellular work depends on ATP energizing other molecules by phosphorylation.
  2. 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).
  3. The ability of a solution surrounding a cell to cause that cell to gain or lose water.
  4. A measure of disorder. One form of disorder is heat, which is random molecular motion.
  5. A nonprotein molecule or ion that is required for the proper functioning of an enzyme. See also coenzyme.

5 True/False questions

  1. receptor-mediated endocytosisThe movement of specific molecules into a cell by the inward budding of membranous vesicles. The vesicles contain proteins with receptor sites specific to the molecules being taken in.

          

  2. second law of thermodynamicsThe principle whereby every energy conversion reduces the order of the universe, increasing its entropy. Ordered forms of energy are at least partly converted to heat.

          

  3. first law of thermodynamicsThe principle of conservation of energy. Energy can be transferred and transformed, but it cannot be created or destroyed.

          

  4. exocytosisCellular uptake of molecules or particles via formation of new vesicles from the plasma membrane.

          

  5. feedback inhibitionA substance that reduces the activity of an enzyme by binding to the enzyme's active site in place of the substrate. A competitive inhibitor's structure mimics that of the enzyme's substrate.

          

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