Suppose calcium ion is maintained within an organelle at a concentration1000 times greater than outside the organelle (T = 37 °C). Assuming the membrane is permeable to Ca2+, what is the contribution of Ca2+ to the membrane potential? Which side of the organelle membrane is positive, and which is negative?

In the Nernst equation [V = 62 log10 (Co / Ci)], the term Co represents: cell bio  the intracellular concentration of calcium the extracellular concentration of potassium the extracellular concentration of sodium the intracellular concentration of potassium the membrane potential (in millivolts)

Your friend has made an artificial membrane to study ion concentration gradients in a laboratory and is confused after observing the ion concentration gradient in the image below. Initially (Time 1) there was a very strong concentration gradient across the membrane and your friend expected that ions would move until the concentrations were equal across the membrane. For a short time there was movement of ions but this soon stopped and there is no further change in the situation no matter how long you wait (see Time 2). Time 1 You friend is confused because there is still a strong concentration gradient and there are open ion channels available. So why don't the concentrations equalise? After thinking about it you realise that there must be some information that is incorrect or missing from the diagram above. Select the image below that explains why the ion concentrations remain unequal across the membrane Time 2 Select the correct image by clicking on it (you can only select one…

The cytoplasm of a certain cell is composed of a solution that is 98% water, 2% solutes. Consider the solution shown in the beaker in this picture: FOOE OOS Foor solution. [Select] Cytoplasm is 98% water, 2% solutes. The solution in the beaker would be considered when compared to [Select] The plasma membrane is impermeable to solutes. Beaker solution is 98% water, 2% solutes the cell. We would expect that the cell would [Select] if it was placed in the would account for whatever changes might occur to the volume of the cytoplasm of the cell when it is placed in the solution.