Consider a biological membrane 10.0 nm thick. The diffusion coefficient for potassium ions crossing this biological...
Consider a biological membrane 10.0 nm thick. The diffusion
coefficient for potassium ions crossing this biological membrane is
1.00 X 10 -16 m2/s.
a) Draw a representation of the membrane and the diffusion of
potassium ions. b) Calculate the flow rate of potassium ions moving
across an area 250 nm by 250 nm, if the concentration difference
across the membrane is 0.500 mol/m3.
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Consider a biological membrane 10.0 nm thick. The diffusion
coefficient for potassium ions crossing this biological...
Consider the following hypothetical problem. Potassium ions have a concentration of 115 x 10-3 mol/liter inside...
Consider the following hypothetical problem. Potassium ions have a concentration of 115 x 10-3 mol/liter inside the cell and 4.5 x 10-3 mol/liter outside the cell. The cell wall has a channel through which the potassium ions can travel and it is 25.0 nm in length and 4.00 nm in diameter. Take the diffusion coefficient of potassium to be 3.00 x 10-9 m2/s. A. What is the difference in concentration, Δc across the cell wall in molecules/m3? B. What is...
Consider the following hypothetical problem. Potassium ions have a concentration of 115 x 10-3mol/liter inside the...
Consider the following hypothetical problem. Potassium ions have a concentration of 115 x 10-3mol/liter inside the cell and 4.5 x 10-3 mol/liter outside the cell. The cell wall has a channel through which the potassium ions can travel and it is 25.0 nm in length and 4.00 nm in diameter. Take the diffusion coefficient of potassium to be 3.00 x 10-9 m2/s. A)What is the difference in concentration, Δc across the cell wall in molecules/m3? B)What is the cross-sectional area...
Consider the following hypothetical problem. Potassium ions have a concentration of 115 x 10*3 molliter inside...
Consider the following hypothetical problem. Potassium ions have a concentration of 115 x 10*3 molliter inside the cell and 4.5 x 10 mol/liter outside the cell. The cell wall has a channel through which the potassium ions can travel and it is 25.0 nm in length and 4.00 nm in diameter. Take the diffusion coefficient of potassium to be 3.00 x 109 m2ls. What is the difference in concentration, Δc across the cell wall in molecules/m3? molecules/m Submit Request Answer...
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Potassium ions (K+) move across a 7.0-nm- thick cell membrane from the inside to the outside. The potential inside the cell is −80.0 mV, and the potential outside is zero. What is the change in the electrical potential energy Δ? electric of the potassium ions as they move across the membrane?
0 Attempt 1 of 22> Potassium ions (K) move across a 9.0-nm-thick cell membrane from the...
0 Attempt 1 of 22> Potassium ions (K) move across a 9.0-nm-thick cell membrane from the inside to the outside. The potential inside the cell is -70.0 mV, and the potential outside is zero. What is the change in the electrical potential energy AU of the potassium ions as they move across the membrane? AUelectric =1 1.214 ×10-20
A protein diffuses from left to right through a thick biological membrane (thickness = 10 cm)...
A protein diffuses from left to right through a thick biological membrane (thickness = 10 cm) having a cross-sectional area of 6 cm2. The diffusion coefficient D for this membrane-protein system is 5.0 x 10-10 m2/s. A total mass of 8.0 x 10-14 kg of the protein is transported across the membrane in 15 sec. If the protein density on the left side of the membrane is 3.77 x 10-3 kg/m3, compute the protein density on the right side of...
Potassium ions (K+)(K+) move across a 9.0-nm-9.0-nm-thick cell membrane from the inside to the outside. The...
Potassium ions (K+)(K+) move across a 9.0-nm-9.0-nm-thick cell membrane from the inside to the outside. The potential inside the cell is −60.0 mV,−60.0 mV, and the potential outside is zero. What is the change in the electrical potential energy Δ? electricΔU electric of the potassium ions as they move across the membrane? Δ? electric = ... J?
The concentration of glucose outside a bacterial membrane of thickness 10 nm is found to be...
The concentration of glucose outside a bacterial membrane of thickness 10 nm is found to be 0.5mol/dm3. Inside the cell the glucose concentration is 0.05 mol/dm3. Measurement of the amount of glucose crossing the bacterial membrane yields a flux of 1.20 mol*m-2*s-1. Assuming that this glucose flux is due solely to diffusion, determine the diffusion coefficient of glucose. Assume that pores constitute 5.0% of the bacterial membrane area.
Under certain circumstances, potassium ions K++ move across the 8.0-nm-thick cell membrane from the inside to...
Under certain circumstances, potassium ions K++ move across the
8.0-nm-thick cell membrane from the inside to the outside. The
potential inside the cell is -80.0 mV, and the potential outside is
zero. Assume that a potassium ion carries a charge of
1.602××10−19−19 C.
Unit 3: Prelecture Problems Problems: Electric Potential & Capacitor Deadline: 100% until Sunday, January 27 at 11:59 PM ▼ Cumulative Problem 6 Under certain circumstances, potassium ions K+ move across the 8.0-nm-thick cell membrane from the inside...
An observer watches calcium ions (Ca+2) crossing a membrane, and measures a total current density of...
An observer watches calcium ions (Ca+2) crossing a membrane, and measures a total current density of 256 mA/cm^2 (in the x direction). The particle flux generated by the electric field is 6 x 10^-6 mol/sec•cm^2. If the concentration gradient of calciun ions is 15 x 10^-3 mol/cm^4, what is the diffusion coefficient?
Consider the following hypothetical problem. Potassium ions have a concentration of 115 x 10*3 molliter inside the cell and 4.5 x 10 mol/liter outside the cell. The cell wall has a channel through which the potassium ions can travel and it is 25.0 nm in length and 4.00 nm in diameter. Take the diffusion coefficient of potassium to be 3.00 x 109 m2ls. What is the difference in concentration, Δc across the cell wall in molecules/m3? molecules/m Submit Request Answer...
0 Attempt 1 of 22> Potassium ions (K) move across a 9.0-nm-thick cell membrane from the inside to the outside. The potential inside the cell is -70.0 mV, and the potential outside is zero. What is the change in the electrical potential energy AU of the potassium ions as they move across the membrane? AUelectric =1 1.214 ×10-20
Under certain circumstances, potassium ions K++ move across the
8.0-nm-thick cell membrane from the inside to the outside. The
potential inside the cell is -80.0 mV, and the potential outside is
zero. Assume that a potassium ion carries a charge of
1.602××10−19−19 C.
Unit 3: Prelecture Problems Problems: Electric Potential & Capacitor Deadline: 100% until Sunday, January 27 at 11:59 PM ▼ Cumulative Problem 6 Under certain circumstances, potassium ions K+ move across the 8.0-nm-thick cell membrane from the inside...
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