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5 Written Questions

5 Matching Questions

  1. hypertonic solution
  2. facilitated diffusion
  3. osmoregulation
  4. entropy
  5. first law of thermodynamics
  1. a The principle of conservation of energy. Energy can be transferred and transformed, but it cannot be created or destroyed.
  2. b Method by which organisms regulate solute concentrations and balance the gain and loss of water.
  3. c Referring to a solution that, when surrounding a cell, will cause the cell to lose water.
  4. d The passage of a substance through a specific transport protein across a biological membrane down its concentration gradient.
  5. e A measure of disorder. One form of disorder is heat, which is random molecular motion.

5 Multiple Choice Questions

  1. Thermal energy; the amount of energy associated with the movement of the atoms and molecules in a body of matter. Heat is energy in its most random form.
  2. 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.
  3. Cellular "eating"; a type of endocytosis whereby a cell engulfs macromolecules, other cells, or particles into its cytoplasm.
  4. 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.
  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. kinetic energyThe energy that matter possesses because of its location or arrangement. Water behind a dam and chemical bonds possess potential energy.

          

  2. potential energyThe energy that matter possesses because of its location or arrangement. Water behind a dam and chemical bonds possess potential energy.

          

  3. osmosisThe movement of materials out of the cytoplasm of a cell by the fusion of vesicles with the plasma membrane.

          

  4. active 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. noncompetitive inhibitorA 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.

          

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