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A 75 kg person doing light work requires about 3000 kcal of food energy per day, 40% of which is actually used by the body's cells. (The other 60% is lost as heat and in waste products.) Before being used by the cells, effectively all of this energy is stored in ATP, which is then cleaved into ADP and PO₂², with the release of 12.5 kcal per mole of ATP. (a) How many moles of ATP are turned over per day in this fashion? What mass of ATP does this correspond to? (The molecular weight of ATP is 507 g/mol.) (b) The body actually contains approximately 5 g ATP. Estimate the average recycle time for an ATP molecule. You see that it is much more efficient to reuse ADP rather than to synthesize it de novo (from scratch).

A 75 kg person doing light work requires about 3000 kcal of food energy per day, 40% of which is actually used by the body's cells. (The other 60% is lost as heat and in waste products.) Before being used by the cells, effectively all of this energy is stored in ATP, which is then cleaved into ADP and PO₂², with the release of 12.5 kcal per mole of ATP. (a) How many moles of ATP are turned over per day in this fashion? What mass of ATP does this correspond to? (The molecular weight of ATP is 507 g/mol.) (b) The body actually contains approximately 5 g ATP. Estimate the average recycle time for an ATP molecule. You see that it is much more efficient to reuse ADP rather than to synthesize it de novo (from scratch).

Biochemistry
Biochemistry
9th Edition
ISBN:9781319114671
Author:Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.
Publisher:Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.
Chapter1: Biochemistry: An Evolving Science
Section: Chapter Questions
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2.2 A 75 kg person doing light work requires about 3000 kcal of food energy per day, 40% of which is actually used by the body's cells. (The other 60% is lost as heat and in waste products.) Before being used by the cells, effectively all of this energy is stored in ATP, which is then cleaved into ADP and PO², with the release of 12.5 kcal per mole of ATP. (a) How many moles of ATP are turned over per day in this fashion? What mass of ATP does this correspond to? (The molecular weight of ATP is 507 g/mol.) (b) The body actually contains approximately 5 g ATP. Estimate the average recycle time for an ATP molecule. You see that it is much more efficient to reuse ADP rather than to synthesize it de novo (from scratch).
Transcribed Image Text:2.2 A 75 kg person doing light work requires about 3000 kcal of food energy per day, 40% of which is actually used by the body's cells. (The other 60% is lost as heat and in waste products.) Before being used by the cells, effectively all of this energy is stored in ATP, which is then cleaved into ADP and PO², with the release of 12.5 kcal per mole of ATP. (a) How many moles of ATP are turned over per day in this fashion? What mass of ATP does this correspond to? (The molecular weight of ATP is 507 g/mol.) (b) The body actually contains approximately 5 g ATP. Estimate the average recycle time for an ATP molecule. You see that it is much more efficient to reuse ADP rather than to synthesize it de novo (from scratch).
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