Chapter 12 Study Questions
- Is the main function of aerobic respiration the production of ATP? Explain your answer. What are the respective contributions of glycolysis and oxidative phosphorylation to the cellular ATP pool?
- Compare and contrast the flow of oxygen and CO2 in photosynthesis and respiration.
- Describe the steps whereby a molecule of sucrose is oxidized to CO2 in glycolysis, the pentose phosphate pathway, and the citric acid cycle. During which steps is CO2 released, and during which steps is energy conserved?
- What are the metabolic advantages and disadvantages of anaerobic fermentation?
- Why is the malic enzyme necessary for mitochondrial oxidation of stored malate? Why can’t malate enter the citric acid cycle via the malate dehydrogenase reaction?
- Compare the electron transport chains in mitochondria and chloroplasts with respect to membrane gradients and energy conservation.
- How do mitochondria exchange metabolites with the rest of the cell? In which cases does the exchange cost energy, and where is this energy derived from?
- Which enzyme is responsible for cyanide-resistance respiration in plants? What are the energetic consequences of cyanide-resistance respiration?
- What is the general chemical structure of triacylglycerols? Where are triacylglycerols stored? What determines whether triacylglycerols are oils or fats?
Textbook Reference: Overview of Plant Respiration, pp. 317–321; Mitochondrial Electron Transport and ATP Synthesis, pp. 339–340
Textbook Reference: Overview of Plant Respiration, pp. 317–321
Textbook Reference: Overview of Plant Respiration, p. 320; The Oxidative Pentose Phosphate Pathway, p. 325; The Citric Acid Cycle, p. 328
Textbook Reference: Glycolysis, pp. 323–324
Textbook Reference: The Citric Acid Cycle, p. 328
Textbook Reference: Mitochondrial Electron Transport and ATP Synthesis, p. 331
Textbook Reference: Mitochondrial Electron Transport and ATP Synthesis, pp. 334–335
Textbook Reference: Mitochondrial Electron Transport and ATP Synthesis, pp. 332–333, 336–338
Textbook Reference: Lipid Metabolism, pp. 343–344