What is ∆G for one cycle of the sodium-potassium exchange pump? b. In a cell, the energy released from the hydrolysis of ATP is approximately 60 kJ/mol. What is the energy efficiency of the sodium-potassium exchange pump?
What is ∆G for one cycle of the sodium-potassium exchange pump? b. In a cell, the energy released from the hydrolysis of ATP is approximately 60 kJ/mol. What is the energy efficiency of the sodium-potassium exchange pump?
Related questions
Question
a. What is ∆G for one cycle of the sodium-potassium exchange pump?
b. In a cell, the energy released from the hydrolysis of ATP is approximately 60 kJ/mol. What is the energy efficiency of the sodium-potassium exchange pump?
![4. One cycle of a sodium-potassium exchange pump, powered by the hydrolysis of one molecule
of ATP, moves three Nations out of the cell and two K+ ions into the cell. Each ion moves
through a changing electric potential and a changing concentration. The change in the Gibbs
free energy is AG = AGelec +AG conc. The electric contribution is simply AGelec = AUelec
The concentration contribution is due to a change in entropy. This process is similar to
osmosis, and a similar expression applies: AGcone = NkBT ln(cf/ci), where N is the number
of ions moved and c; and cf are the initial and final concentrations. Consider a muscle cell
that has a membrane potential of -90 mV. The sodium ion concentrations are [Na+]in = 15
mM and [Na+]out = 150 mM. The potassium ion concentrations are [K+]in = 150 mM and
[Na+]out = 4 mM. Assume a termperature of 37°C.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F3600976f-5a74-4553-80f1-af12fd18d682%2F1996835a-3677-43f2-a82d-9c0349ddf5f3%2Fa8t26cr_processed.png&w=3840&q=75)
Transcribed Image Text:4. One cycle of a sodium-potassium exchange pump, powered by the hydrolysis of one molecule
of ATP, moves three Nations out of the cell and two K+ ions into the cell. Each ion moves
through a changing electric potential and a changing concentration. The change in the Gibbs
free energy is AG = AGelec +AG conc. The electric contribution is simply AGelec = AUelec
The concentration contribution is due to a change in entropy. This process is similar to
osmosis, and a similar expression applies: AGcone = NkBT ln(cf/ci), where N is the number
of ions moved and c; and cf are the initial and final concentrations. Consider a muscle cell
that has a membrane potential of -90 mV. The sodium ion concentrations are [Na+]in = 15
mM and [Na+]out = 150 mM. The potassium ion concentrations are [K+]in = 150 mM and
[Na+]out = 4 mM. Assume a termperature of 37°C.
Expert Solution
This question has been solved!
Explore an expertly crafted, step-by-step solution for a thorough understanding of key concepts.
This is a popular solution!
Trending now
This is a popular solution!
Step by step
Solved in 3 steps with 3 images
