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5 Written questions

5 Matching questions

  1. energy
  2. chemical energy
  3. phosphorylation
  4. active site
  5. heat
  1. a The transfer of a phosphate group, usually from ATP, to a molecule. Nearly all cellular work depends on ATP energizing other molecules by phosphorylation.
  2. b The part of an enzyme molecule where a substrate molecule attaches (by means of weak chemical bonds); typically, a pocket or groove on the enzyme's surface.
  3. c Energy available in molecules for release in a chemical reaction; a form of potential energy.
  4. d 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.
  5. e The capacity to perform work, or to rearrange matter.

5 Multiple choice questions

  1. 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.
  2. Main energy source for cells.
  3. The diffusion of water across a selectively permeable membrane.
  4. Referring to a solution that, when surrounding a cell, will cause the cell to take up water.
  5. 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).

5 True/False questions

  1. entropyThe capacity to perform work, or to rearrange matter.

          

  2. isotonic solutionReferring to a solution that, when surrounding a cell, will cause the cell to take up water.

          

  3. active transportThe 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).

          

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

          

  5. aquaporinThe diffusion of water across a selectively permeable membrane.

          

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