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Chapter 24: Q6P (page 1108)
Palmitic acid is a 16-carbon saturated fatty acid. How many molecules of acetyl-CoA are formed from one molecule of palmitic acid?
8 molecules of acetyl CoA are formed from 1 molecule of palmitic acid.
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Do the calculation showing that at pH 7.4
a.the charge on ADP is -2.8. b. the charge on the alkyl phosphate is -1.8.
Oxidation of glyceraldehyde-3-phosphate to 1,3-bisphosphoglycerate is an endergonic reaction, but the flow through this point in glycolysis proceeds smoothly. How is the unfavorable equilibrium constant overcome?
A student is trying to determine the mechanism for a reaction that uses ATP to activate a carboxylate ion, which reacts with a thiol. If the carboxylate ion attacks the gamma- phosphorous of ATP, the reaction products are the thioester, ADP, and phosphate. However, whether it attacks the alpha-phosphorous or the beta-phosphorous of ATP cannot be determined from the reaction products because the thioester, AMP, and pyrophosphate would be the products in both reactions. The mechanisms can be distinguished by a labelling experiment in which the enzyme, the carboxylate ion, ATP, and radioactively labelled pyrophosphate are incubated, and then the ATP is isolated. If the isolated ATP is radioactive, the attack occurs on the alpha-phosphorous. If it is not radioactive, an attack occurs on the beta- phosphorous. Explain these conclusions.
Why does the OH group add to the -carbon rather than to the -carbon in the second reaction in the -oxidation of fats?
Which carbon atoms of glucose end up as a carboxyl group in pyruvate?
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