Water Molecules and Small Ions Enter a Cell Through

Question

Water molecules and small ions enter a cell through
A) channels formed by integral membrane proteins.
B) peripheral proteins.
C) lipid channels.
D) peripheral carbohydrates.
E) defects in the lipid layer of the membrane.

Accepted Answer

Channels formed by integral membrane proteins allow for the specific and regulated movement of water molecules and small ions into and out of the cell. Peripheral proteins and carbohydrates do not typically perform this function, and lipid channels do not exist. Defects in the lipid layer of the membrane can occur, but they are not a reliable mechanism for the controlled entry of small molecules into the cell.