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6 Written questions

6 Multiple choice questions

  1. The metabolic cycle fueled by acetyl CoA formed after glycolysis in cellular respiration. Chemical reactions in the citric acid cycle complete the metabolic breakdown of glucose molecules to carbon dioxide. The cycle occurs in the matrix of mitochondria and supplies most of the NADH molecules that carry energy to the electron transport chains. The second major stage of cellular respiration.
  2. One 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. The formation of ATP by an enzyme directly transferring a phosphate group to ADP from an organic molecule
  4. Energy-coupling mechanics that uses the energy of hydrogen ion gradients across membranes to phosphorylate ADP; powers most ATP synthesis in cells
  5. The production of ATP using energy derived from the redox reactions of an electron transport chain; the third major stage of cellular respiration
  6. The loss of electrons from a substance involved in a redox reaction; always accompanies reduction

6 True/False questions

  1. dehydrogenaseAn enzyme that catalyzes a chemical reaction during which one or more hydrogen atoms are removed from a molecule

          

  2. acetyl CoAThe entry compound for the citric acid cycle in cellular respiration; formed from a fragment of pyruvate attached to a coenzyme

          

  3. ATP synthaseA 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

          

  4. obligate anaerobesAn organism that makes ATP by aerobic respiration if oxygen is present, but that switches to fermentation when oxygen is absent

          

  5. alcohol fermentationThe conversion of pyruvate to lactate with no release of carbon dioxide.

          

  6. reductionThe gain of electrons by a substance involved in a redox reaction; always accompanies oxidation

          

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