Question

In many animal cells, the uptake of glucose into the cell occurs by a cotransport mechanism, in which glucose is cotransported with Na^+ ions. Complete the diagram below using the following steps. Drag the pink labels to the pink targets, indicating the relative concentration at glucose inside and outside the cell. Drag the correct white target to the white target, indicating the direction that Na^+ ions and glucose move through the cotransporter Drag the blue labels to complete the sentences on the right, indicating how Na^+ ions and glucose move through the cotransporter relative to their electrochemical and concentration gradients.

Answer 1

(a) Outside the Cell

(Is the opposite of what takes place inside the cell)

[Na+] high

[glucose] low

(b) For glucose-sodium cotransporter

{glucose} down

{Na+} down

1. {Na+}

flows downward to its electrochemical gradient.

2. {Glucose}

flows across its concentration gradient.

(c) Inside the cell

(Is the opposite of what takes place outside the cell)

[Na+] low

[glucose] high