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6 Written questions

6 Multiple choice questions

  1. A cluster of several membrane proteins that function in chemiosmosis with adjacent electron transport chains, using the energy of a hydrogen ion concentration gradient to make ATP
  2. An organism that makes ATP by aerobic respiration if oxygen is present, but that switches to fermentation when oxygen is absent
  3. The entry compound for the citric acid cycle in cellular respiration; formed from a fragment of pyruvate attached to a coenzyme
  4. Short for oxidation-reduction; a chemical reaction in which electrons are lost from one substance (oxidation) and added to another (reduction). Oxidation and reduction always occur together
  5. The multistep chemical breakdown of a molecule of glucose into two molecules of pyruvate; the first stage of cellular respiration in all organisms; occurs in the cytoplasmic fluid
  6. The aerobic harvesting of energy from food molecules; the 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

6 True/False questions

  1. obligate anaerobesAn organism that only carries out fermentation; such organisms cannot use oxygen and also may be poisoned by it.


  2. intermediatesOne of the compounds that form between the initial reactant and the final product in a metabolic pathway, such as between glucose and pyruvate in glycolysis


  3. lactic acid fermentationThe conversion of pyruvate from glycolysis to carbon dioxide and ethyl alcohol


  4. oxidationThe gain of electrons by a substance involved in a redox reaction; always accompanies oxidation


  5. chemiosmosisEnergy-coupling mechanics that uses the energy of hydrogen ion gradients across membranes to phosphorylate ADP; powers most ATP synthesis in cells


  6. alcohol fermentationThe conversion of pyruvate from glycolysis to carbon dioxide and ethyl alcohol


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