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5 Written questions

5 Matching questions

  1. cellular respiration
  2. induced fit
  3. facilitated diffusion
  4. selective permeability
  5. feedback inhibition
  1. a 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.
  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 property of biological membranes that allows some substances to cross more easily than others and blocks the passage of other substances altogether.
  4. d The passage of a substance through a specific transport protein across a biological membrane down its concentration gradient.
  5. e A method of metabolic control in which a product of a metabolic pathway acts as an inhibitor of an enzyme within that pathway.

5 Multiple choice questions

  1. A transport protein in the plasma membrane of some plant or animal cells that facilitates the diffusion of water across the membrane (osmosis).
  2. 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.
  3. 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.
  4. Referring to a solution that, when surrounding a cell, will cause the cell to take up water.
  5. An energy-releasing chemical reaction in which the reactants contain more potential energy than the products. The reaction releases an amount of energy equal to the difference in potential energy between the reactants and the products.

5 True/False questions

  1. phagocytosisCellular "drinking"; a type of endocytosis in which the cell takes fluid and dissolved solutes into small membranous vesicles.


  2. receptor-mediated endocytosisThe 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.


  3. active siteThe ability of a solution surrounding a cell to cause that cell to gain or lose water.


  4. exocytosisThe movement of materials out of the cytoplasm of a cell by the fusion of vesicles with the plasma membrane.


  5. fluid mosaicA description of membrane structure, depicting a cellular membrane as a mosaic of diverse protein molecules embedded in a fluid bilayer made of phospholipid molecules.