举一反三
- 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
- In fatty acid biosynthesis, which compound transports acetyl groups from the mitochondria into the cytoplasm？（） A: Coenzyme A B: Carnitine C: ACP D: Citric acid
- 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
- Carnitine, a zwitterionic compound derived from lysine, is involved in fatty acid metabolism and is required at which two points in the transport of fatty acids from the cytoplasm to the mitochondria (see Figure 3-5) A: A and E B: A and C C: B and C D: B and D E: E and D
- Some athletes believe that dietary carnitine supplements will enhance their ability to perform aerobic exercise. Which statement BEST describes the “scientific” basis of this belief? A: Carnitine is required in the transport of medium and long-chain fatty acids into the mitochondrial matrix, and so increasing the amount of carnitine will increase the rate of transport. B: Carnitine activates carnitine-acyl transferase-1 (CAT-I) thereby increasing the rate of transport of fatty acids into the mitochondrial matrix. C: Carnitine levels in the cytoplasm are reduced when large amounts of fatty acyl carnitine are transported into the mitochondrial matrix. D: Carnitine enhances the activation of fatty acids to fatty acyl-CoA, thereby increasing the rate of their transport into the mitochondrial matrix.
内容
- 0
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.
- 1
Which is the following can transfer acetyl group from mitochondria to cytoplasm
- 2
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.
- 3
Acetyl-CoA<br/>can be formed from() A: Pyruvate B: Fatty<br/>acids C: Ketone<br/>bodies D: All<br/>of these
- 4
The subcellular site of the breakdown of long chain fatty acids to acetyl-CoA via -oxidation is: