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5 Written Questions

5 Matching Questions

  1. heat
  2. aquaporin
  3. pinocytosis
  4. endocytosis
  5. enzyme
  1. a 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. b Cellular "drinking"; a type of endocytosis in which the cell takes fluid and dissolved solutes into small membranous vesicles.
  3. c 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.
  4. d A transport protein in the plasma membrane of some plant or animal cells that facilitates the diffusion of water across the membrane (osmosis).
  5. e Cellular uptake of molecules or particles via formation of new vesicles from the plasma membrane.

5 Multiple Choice Questions

  1. The energy that matter possesses because of its location or arrangement. Water behind a dam and chemical bonds possess potential energy.
  2. 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.
  3. The movement of materials out of the cytoplasm of a cell by the fusion of vesicles with the plasma membrane.
  4. Cellular "eating"; a type of endocytosis whereby a cell engulfs macromolecules, other cells, or particles into its cytoplasm.
  5. 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).

5 True/False Questions

  1. 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).

          

  2. osmoregulationMethod by which organisms regulate solute concentrations and balance the gain and loss of water.

          

  3. chemical energyEnergy available in molecules for release in a chemical reaction; a form of potential energy.

          

  4. phosphorylationThe transfer of a phosphate group, usually from ATP, to a molecule. Nearly all cellular work depends on ATP energizing other molecules by phosphorylation.

          

  5. thermodynamicsThe study of energy transformation that occurs in a collection of matter. See first law of thermodynamics; second law of thermodynamics.

          

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