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5 Written questions

5 Matching questions

  1. diffusion
  2. receptor-mediated endocytosis
  3. entropy
  4. kinetic energy
  5. competitive inhibitor
  1. a 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.
  2. b The spontaneous tendency of a substance to move down its concentration gradient from where it is more concentrated to where it is less concentrated.
  3. c A measure of disorder. One form of disorder is heat, which is random molecular motion.
  4. d The energy of motion; the energy of a mass of matter that is moving. Moving matter does work by imparting motion to other matter.
  5. e 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 Multiple choice questions

  1. The ability of a solution surrounding a cell to cause that cell to gain or lose water.
  2. The passage of a substance through a specific transport protein across a biological membrane down its concentration gradient.
  3. The diffusion of water across a selectively permeable membrane.
  4. An energy-requiring chemical reaction, which yields products with more potential energy than the reactants. The amount of energy stored in the products equals the difference between the potential energy in the reactants and that in the products.
  5. 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 True/False questions

  1. metabolismThe totality of an organism's chemical reactions.


  2. potential energyThe energy that matter possesses because of its location or arrangement. Water behind a dam and chemical bonds possess potential energy.


  3. feedback inhibitionA method of metabolic control in which a product of a metabolic pathway acts as an inhibitor of an enzyme within that pathway.


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


  5. chemical energyEnergy available in molecules for release in a chemical reaction; a form of potential energy.


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