Question

Consider a secondary active transporter that uses symport for two molecules, X and Y. If X is the molecule being actively pumped and Y is present in higher concentration inside the cell, which of the following is true? (It might be helpful to sketch out the situation to visualize it better.) Xis present at higher concentrations inside the cell. X is being pumped from outside the cell into the cell. Xis present at higher concentrations outside the cell. Y is moving against its concentration gradient (from low to high concentration). Question 6 1 pts When would a Ca2+-gated K channel transport Kt? Only when the Ca2+ ligand is present. Always it is essentially an open pore in the membrane. Never--it transports Ca2+ Only when an energy source like ATP hydrolysis is used.

Answer 1

In Secondary active transporter that uses symporti One molecule goes along its concentration gradient, that is passively. Other molecule goes against its concentration gradient, that is actively. But Both the molecule move in same direction. Here, it is actively pumped means 'y' is passively moving along its concentration gradient. xxx myy Less t' inside cell So, Actively C yy y \ Y Yyt Y Y mode 'Y' inside so, passively cell cell So, we can say that: • x is present at higher concentration outside the Cell Question . Cazt gated kt channel means it is a channel! for kt regulated by Ca²+. Only when the Caht ligand is present.