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5 Written questions

5 Matching questions

  1. receptor-mediated endocytosis
  2. heat
  3. phagocytosis
  4. cellular respiration
  5. pinocytosis
  1. a 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).
  2. b 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.
  3. c Cellular "drinking"; a type of endocytosis in which the cell takes fluid and dissolved solutes into small membranous vesicles.
  4. d Cellular "eating"; a type of endocytosis whereby a cell engulfs macromolecules, other cells, or particles into its cytoplasm.
  5. e The movement of specific molecules into a cell by the inward budding of membranous vesicles. The vesicles contain proteins with receptor sites specific to the molecules being taken in.

5 Multiple choice questions

  1. The spontaneous tendency of a substance to move down its concentration gradient from where it is more concentrated to where it is less concentrated.
  2. A description of membrane structure, depicting a cellular membrane as a mosaic of diverse protein molecules embedded in a fluid bilayer made of phospholipid molecules.
  3. The ability of a solution surrounding a cell to cause that cell to gain or lose water.
  4. The diffusion of water across a selectively permeable membrane.
  5. The diffusion of a substance across a biological membrane, without any input of energy.

5 True/False questions

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

          

  2. metabolismA transport protein in the plasma membrane of some plant or animal cells that facilitates the diffusion of water across the membrane (osmosis).

          

  3. cofactorA nonprotein molecule or ion that is required for the proper functioning of an enzyme. See also coenzyme.

          

  4. potential energyThe energy of motion; the energy of a mass of matter that is moving. Moving matter does work by imparting motion to other matter.

          

  5. aquaporinA transport protein in the plasma membrane of some plant or animal cells that facilitates the diffusion of water across the membrane (osmosis).

          

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