Question

1. water diffusion through a (click to select) cell membrane is made easier by membrane proteins called aquaporins. (click to select) concentration gradient filtration high hydrophilic hydrophobic low osmosis osmotic pressure

Explanation:

The cell membrane has a hydrophobic interior (due to the lipid bilayer). Water is polar, so diffusion through the membrane is limited without help. Aquaporins facilitate water diffusion through the hydrophobic cell membrane. The term that describes the cell membrane's nature (which makes water diffusion hard without aquaporins) is hydrophobic.

Answer:

hydrophobic