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6 Written questions

6 Multiple choice questions

  1. 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
  2. An organism that only carries out fermentation; such organisms cannot use oxygen and also may be poisoned by it.
  3. 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.
  4. An organism that makes ATP by aerobic respiration if oxygen is present, but that switches to fermentation when oxygen is absent
  5. 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
  6. 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

6 True/False questions

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


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


  3. intermediatesThe gain of electrons by a substance involved in a redox reaction; always accompanies oxidation


  4. cellular respirationThe 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


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


  6. kilocaloriesa quantity of heat equal to 1,000 calories. Used to measure the energy content of food, it is usually called a "Calorie"