Question

Special channels called aquaporins allow water to move between cells. These channel proteins are selective- they freely let water molecules through the membrane but NOT ions or other molecules- but (like leak channels) are not gated.Based on those facts, state which of the following would be the most likely to determines the direction (and how quickly) water can move across a membrane using aquaporins, and (in a few sentences) explain your answer.

how much ATP is present inside the cell

what the resting membrane potential is

what the concentration of different solutes are on the inside of the cell relative to the outside of the cell

Answer 1

Answer
The movement of water between cells to regulate many biological process is through water channel. Aquaporin is the known water channel present on the cell membrane. It allows only movement of water molecule through the channel and restrict movement of ions. It composed of six transmembrane alpha helix structure. It contain two hydrophobic loops. It shape is like ‘hourglass’ narrow in the middle and broader at the ends. There are presence of ar/R selective filter to restrict the molecule other than water in the middle.
It maintain the osmolarity of the cell. The movement of water from its higher concentration to its lower concentration. It can help plants from drought and salt stresses.
According to the above information solute concentration on inside and outside of the cell determine movement of water.