Question

A 70 kg (154 lb) adult requires a calorie intake of 2,000 kcal (8,360 kJ) of food per day. The food is metabolized, and the free energy is used to synthesize ATP for useful work. The efficiency of converting food energy into ATP is 50%. 1) Calculate the mass of ATP used by an adult human in 24 hours. (ATP formula weight = 505 g/mol, ΔG'° = -30.5 kJ/mol) 2) If ATP is present at 5 mM inside cells, and if the intracellular volume corresponds to about 25% of an adult's mass, how frequently is an ATP molecule hydrolyzed and rephosphorylated, on average?

          A 70 kg (154 lb) adult requires a calorie intake of 2,000 kcal (8,360 kJ) of food per day. The food is metabolized, and the free energy is used to synthesize ATP for useful work. The efficiency of converting food energy into ATP is 50%.

1) Calculate the mass of ATP used by an adult human in 24 hours.
(ATP formula weight = 505 g/mol, ΔG'° = -30.5 kJ/mol)

2) If ATP is present at 5 mM inside cells, and if the intracellular volume corresponds to about 25% of an adult's mass, how frequently is an ATP molecule hydrolyzed and rephosphorylated, on average?

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Added by Jes-S P.

Chemistry: Structure and Properties

Nivaldo Tro 2nd Edition

Instant Answer

Solved by Expert Madhur L

08/08/2023

Step 1

First, we need to find out how much energy is converted into ATP. Since the efficiency of converting food energy into ATP is 50%, we have: Energy converted into ATP = 0.5 * 2000 kcal = 1000 kcal Now, we need to convert kcal to kJ: 1000 kcal * 4.184 kJ/kcal = Show more…

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A 70 kg (154 lb) adult requires a calorie intake of 2,000 kcal (8,360 kJ) of food per day. The food is metabolized, and the free energy is used to synthesize ATP for useful work. The efficiency of converting food energy into ATP is 50%. 1) Calculate the mass of ATP used by an adult human in 24 hours. (ATP formula weight = 505 g/mol, ΔG'° = -30.5 kJ/mol) 2) If ATP is present at 5 mM inside cells, and if the intracellular volume corresponds to about 25% of an adult's mass, how frequently is an ATP molecule hydrolyzed and rephosphorylated, on average?

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