Cell Membrane and Transport Mechanisms

The cell membrane forms the outer boundary of an animal cell and sits just inside the cell wall of a plant cell. It is selectively permeable, meaning it controls what substances can enter and leave the cell.

False

<p>Simple diffusion is the movement of small molecules like water, dissolved gases, or lipid-soluble molecules across a phospholipid bilayer membrane from an area of high concentration to an area of low concentration.</p> Signup and view all the answers

<p>Facilitated transport uses channels or carrier proteins to help larger, water-soluble molecules or ions move across the cell membrane down their concentration gradient.</p> Signup and view all the answers

<p>Osmosis is the diffusion of water across a selectively permeable membrane from an area of high water concentration to an area of low water concentration.</p> Signup and view all the answers

<p>The cell expands.</p> Signup and view all the answers

<p>The cell loses water and shrinks.</p> Signup and view all the answers

<p>An isotonic solution has the same concentration of solutes as the cell, meaning the water concentration is equal inside and outside the cell.</p> Signup and view all the answers