Question

28. Which one of the following statements is true? a) The brain b) Muscle cannot use fatty acids as an energy source. c) The brain exports ketone bodies as fuels for other tissues d) Fatty acids cannot be used as an energy source in humans e) as an energy source, but can use ketone bodies enzymes of the Glyoxylate cycle Heart muscle stores fuel as glycogen. 29. An intermediate found in gluconeogenesis and not in glycolysoxaloacetate a) 2-phosphoglycerate b) phosphoenolpyruvate c) fructose-1,6-bisphosphate e) 3-phosphoglycerate 30. The relative concentrations of ATP and ADP control the cellular rates ofd cycle d) The citric acid e) All of the above. a) Glycolysis. b) Oxidative phosphorylation. c) Pyruvate oxidation. SECTION C: FILL-IN THE BLANK QUESTIONS IPTS: 10 te blank spaces with the correct word s)Make sure to watch your Fill the in occur by separate pathways. 31. The synthesis of fatty acids and their breakdown by B-oxidation Compare the two paths by filling in the table below. [6] B-oxidation Synthesis Electron carrier coenzymes(s) Basic units added or removed Cellular location of process giluconeogenesis, glycogen synthesis, or glycogen breakdown (glycogenolysis) pathways (in correct answers for each pathway and each condition may be used for more than one pathway). [4] 32. Indicate which of the conditions listed in the right column increases the activity of the glycolysis Conditions Increase in AMP [A] Increase in F2,6BP [B] Increase in insulin [C Increase in glucagon [D] Starvation [E] Correct Answers Glycolysis Gluconeogenesis Glycogen Synthesis Glycogenolysis Feed State [FI Increase in acetyl-CoA [G SECTION D: SHORT ANSWERS Read each question carefully before answering. [PTS: 25 33. Protein degradation provides free amino acids, which may be further degraded by deamination and transamination in order to (1) synthesize new compounds (intermediates), (2) produce energy, or (3) eliminate waste. Describe the possible fate of free amino acids with specific reference to biochemical reactions and how the products of these reactions may be utilized. [5]

Answer 1

28) Brain prefers glucose as energy source but can use ketone bodies. (True)

Ketone bodies are generated in a process called as ketogenesis and is a result of breaking of fatty acids. It is generated in liver and is water soluble. Mostly during fasting when the blood sugar level diminishes brain uses ketone bodies as alternative source of energy.