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5 Written questions

5 Matching questions

  1. heat
  2. exergonic reaction
  3. entropy
  4. energy
  5. active site
  1. a A measure of disorder. One form of disorder is heat, which is random molecular motion.
  2. b 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.
  3. c 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.
  4. d An energy-releasing chemical reaction in which the reactants contain more potential energy than the products. The reaction releases an amount of energy equal to the difference in potential energy between the reactants and the products.
  5. e The capacity to perform work, or to rearrange matter.

5 Multiple choice questions

  1. The ability of a solution surrounding a cell to cause that cell to gain or lose water.
  2. In cellular metabolism, the use of energy released from an exergonic reaction to drive an endergonic reaction.
  3. 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. The energy that matter possesses because of its location or arrangement. Water behind a dam and chemical bonds possess potential energy.
  5. Main energy source for cells.

5 True/False questions

  1. first 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.


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


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


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


  5. phosphorylationMethod by which organisms regulate solute concentrations and balance the gain and loss of water.


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