which is the definition of adhesion? a. the property in which water molecules stick to one another tightly.
b. the property in which water molecules easily evaporate into a gas.
c. the property in which water molecules are attracted to other polar substances.

What is the significance of the protein-lined pits? a. protein attracts other proteins needed for atp synthesis within the cell. b. protein-lined pits are able to transport one molecule at a time down the concentration gradient within the cell. c. the polarity of proteins allows other polar molecules to attach and be transported in the cell by transport channels. d. receptors within the pits allow ligands to fuse and be transported into the cell by endocytosis.