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5 Written questions

5 Matching questions

  1. aquaporin
  2. cellular respiration
  3. competitive inhibitor
  4. induced fit
  5. endocytosis
  1. a Cellular uptake of molecules or particles via formation of new vesicles from the plasma membrane.
  2. b The aerobic harvesting of energy from food molecules; the energy-releasing chemical breakdown of food molecules, such as glucose, and the storage of potential energy in a form that cells can use to perform work; involves glycolysis, the citric acid cycle, and oxidative phosphorylation (the electron transport chain and chemiosmosis).
  3. c A transport protein in the plasma membrane of some plant or animal cells that facilitates the diffusion of water across the membrane (osmosis).
  4. d 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.
  5. e 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 Multiple choice questions

  1. The passage of a substance through a specific transport protein across a biological membrane down its concentration gradient.
  2. An organic molecule serving as a cofactor. Most vitamins function as coenzymes in important metabolic reactions.
  3. Cellular "eating"; a type of endocytosis whereby a cell engulfs macromolecules, other cells, or particles into its cytoplasm.
  4. Method by which organisms regulate solute concentrations and balance the gain and loss of water.
  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. hypertonic solutionReferring to a solution that, when surrounding a cell, will cause the cell to lose water.


  2. heatThermal 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.


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


  4. energy couplingThe capacity to perform work, or to rearrange matter.


  5. adenosine triphosphate (ATP)The diffusion of a substance across a biological membrane, without any input of energy.


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