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5 Written questions

5 Matching questions

  1. passive transport
  2. induced fit
  3. cofactor
  4. concentration gradient
  5. substrate
  1. a The diffusion of a substance across a biological membrane, without any input of energy.
  2. b A nonprotein molecule or ion that is required for the proper functioning of an enzyme. See also coenzyme.
  3. c (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.
  4. d 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.
  5. e An increase or decrease in the density of a chemical substance in an area. Cells often maintain concentration gradients of ions across their membranes. When a gradient exists, substances tend to move from where they are more concentrated to where they are less concentrated.

5 Multiple choice questions

  1. 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).
  2. Cellular "drinking"; a type of endocytosis in which the cell takes fluid and dissolved solutes into small membranous vesicles.
  3. Method by which organisms regulate solute concentrations and balance the gain and loss of water.
  4. The energy that matter possesses because of its location or arrangement. Water behind a dam and chemical bonds possess potential energy.
  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. tonicityA measure of disorder. One form of disorder is heat, which is random molecular motion.

          

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

          

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

          

  4. selective permeabilityThe 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. diffusionThe spontaneous tendency of a substance to move down its concentration gradient from where it is more concentrated to where it is less concentrated.