It is found that 1,456 calcium cations (Ca2+) migrate across a biological membrane in 13.4 microseconds. Calculate the current across the membrane is Amperes (A).
It is found that 1,456 calcium cations (Ca2+) migrate across a biological membrane in 13.4 microseconds....
A cell biologist interested in the transport of calcium ions (Ca2+) across the plasma membrane of bacterial cells made the following measurements on bacterial cells at 25°C: Vm = -150 mV [Ca2+] outside = 20 mM [C a2+] inside = 0.4 mM Constants: R = 1.987 cal/mol degree; T = Temperature in Kelvin (273+ °C) , F=23062 cal/mol volt, z=charge of the molecule, Vm =membrane potential in V. Note: ∆Ginwards = +RTln([in]/[out]) + zFVm 94. What is the free energy...
Calcium is an important regulator of the citric acid cycle. Calcium is transported across the mitochondrial inner membrane by a Ca2+ uniporter that is driven by the negative potential inside the matrix. Part A Assuming a membrane potential across the inner membrane of 179 mV (inside negative), calculate the ratio of the [Ca2+] in the matrix to that in the cytoplasm ([Ca2+]m/[Ca2+]c) that would exist at equilibrium (i.e., ΔG=0). Part B Cytoplasmic [Ca2+] is on the order of 10−7M in...
Problem 14.21 - Enhanced - with Solution 19 of 19 Assuming a membrane potential across the inner membrane of 177 mV (inside negative), calculate the ratio of the [Ca2 matrix to that in the cytoplasm(Cthat would exist at equilibrium (i.e, AG 0) Express your answer using two significant figures. in the ReviewI Constants Periodic Table Calcium is an important regulator of the citric acid cycle. Calcium is transported across the mitochondrial inner membrane by the negative potential inside the matrix....
(1) Mitochondria regulate the concentration of calcium ions in the cytoplasm, by allowing the ions to equilibrate across the mitochondrial membrane. If the mitochondrion has a membrane potential of –150 mV relative to the cytoplasm, and the cytoplasmic concentration of Ca2+ is 1 μM, what is the mitochondrial Ca2+ concentration? Assume a temperature of 37 C. (2) The membrane calcium pump of the malarial parasite Trypanosoma cruzipumps out calcium ions from the parasite cell interior, hydrolyzing one molecule of ATP...