举一反三
- When fatty acids are readily available as fuels, their breakdown in liver mitochondria yields acetyl-CoA, a signal that further oxidation of glucose for fuel is not necessary.
- The final products of digestion are ? A: fatty acids, starch, glucose B: protein, amino acids, glucose C: protein, fat, carbohydrate D: glucose, amino acids, fatty acids
- Synthesis of fatty acids from acetyl CoA A: need NADPH B: need NAD+ C: produce malonyl CoA in the first step D: occur in mitochondria E: It's the reverse reactions of fatty acid oxidation
- i) The secretion of insulin—which acts to lower the plasma glucose _____—is stimulated by a rise in glucose concentration, for example, and is inhibited by a fall in blood glucose.
- What would be the consequences of inhibiting the carnitine shuttle which transports fatty acids into the mitochondria? A: accumulation of fat droplets in liver and muscle. B: Increase in blood glucose concentration. C: Increase in fatty acid synthesis in the liver. D: Low levels of long chain free fatty acids in the blood.
内容
- 0
The acetyl CoA required for the synthesis of fatty acids is derive from ( ). A: fat mobilization B: β-oxidation of fatty acids C: degradation of amino acids D: glycolysis E: degradation of glucoses
- 1
During long term starvation, the energy in brain mainly come from A: glucose oxidation B: ketone bodies oxidation C: lactate oxidation D: amino acid oxidation E: fatty acid oxidation
- 2
During long term starvation, the energy of brain mainly come from A: glucose oxidation B: fatty acid oxidation C: ketone bodies oxidation D: lactate oxidation E: amino acid oxidation
- 3
If fatty acid synthesis and β oxidation were to proceed simultaneously, the two processes would constitute a futile cycle, wasting energy. We noted earlier that β oxidation is blocked by malonyl-CoA, which inhibits carnitine acyltransferase I. Thus, during fatty acid synthesis, production of the first intermediate, malonyl-CoA, shuts down β oxidation at the level of a transport system in the inner mitochondrial membrane. This control mechanism illustrates another advantage of segregating synthetic and degradative pathways in different cellular compartments.
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The direct energy of muscle contraction is A: ATP B: phosphocreatine C: glucose D: fatty acids