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5 Written questions

5 Matching questions

  1. coenzyme
  2. phagocytosis
  3. entropy
  4. enzyme
  5. pinocytosis
  1. a An organic molecule serving as a cofactor. Most vitamins function as coenzymes in important metabolic reactions.
  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 measure of disorder. One form of disorder is heat, which is random molecular motion.
  5. e Cellular "eating"; a type of endocytosis whereby a cell engulfs macromolecules, other cells, or particles into its cytoplasm.

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 energy that matter possesses because of its location or arrangement. Water behind a dam and chemical bonds possess potential energy.
  3. The capacity to perform work, or to rearrange matter.
  4. The ability of a solution surrounding a cell to cause that cell to gain or lose water.
  5. (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.

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. energy couplingIn cellular metabolism, the use of energy released from an exergonic reaction to drive an endergonic reaction.

          

  3. active transportThe diffusion of a substance across a biological membrane, without any input of energy.

          

  4. 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.

          

  5. adenosine triphosphate (ATP)Main energy source for cells.

          

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