21. During what conditions does fatty acid synthesis take place? 22. For fatty a

Question

21. During what conditions does fatty acid synthesis take place? 22. For fatty acid synthesis, where in the cell does it take place? 23. What are the starting molecul (plenty or starvation) les for the first step of fatty acid synthesis? Circle all that apply. a. Acetyl-CoA b. Malonyl-ACP c. Malonyl-CoA d. Acetyl-ACP 24. What process takes place if too many acetyl-CoA molecules buildup and cannot go through Krebs? a. Urea cycle b. Ketone body formation c. ETC d. Cori Cycle 25. Match the following terms to their description: (10 points) a. chylomicrons b. LDL c. VLDL d. HDL e IDL transports cholesterol from dead/dying cells to the liver transports mostly cholestrol esters transport of VLDL remnants from tissues to liver transports TAGs from the liver to the tissue transports dietary TAGs to the liver Amino Acid Metabolism (14 pts) 26. In transamination reactions, the amino group is taken from the amino acid and forms: a. Acetyl-CoA b. Oxaloacetate ?-Ketoglutarate Glutamate c. d. 27. The oxidative deamination step takes place in a. Cytosol b. Mitochondrial matrix c. Nucleus

Explanation / Answer

21. Fatty acid synthesis generally occurs between meals or during prolonged starvation.

22. Fatty acid synthesis is the formation of fatty acid from acetyl -COA and NADPH through action of enzymes. It takes place in the cytoplasm of the cell.

23. Starting molecule is acetyl -COA.

24. If too many acetyl-COA is bulid up then it is used for biosynthesis of ketone bodies via acetoactyl and 3-hydroxy-3-methylglutaryl-COA.

25.

a. Chylomicrons - transport dietary TAG to the liver

b. LDL - transport of TAGS from the liver to the tissue

c. VLDL - transport mainly chloesterol esters

d.HDL - transport chloesterol from dead/dying cells to the liver

e. IDL - transport of VLDL remants from tissues to liver

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