Cell Membrane Review

Front

What is the function of the cell membrane?

Back

The cell membrane controls the movement of substances in and out of the cell, providing protection and structural support.

Front

Define facilitated diffusion.

Back

Facilitated diffusion is the process by which large or polar molecules move across the cell membrane through protein channels without the use of energy.

Front

What is active transport?

Back

Active transport is the movement of molecules across a cell membrane from a region of lower concentration to a region of higher concentration, using energy in the form of ATP.

Front

Explain osmosis.

Back

Osmosis is the diffusion of water molecules through a selectively permeable membrane from an area of lower solute concentration to an area of higher solute concentration.

Front

What does hypertonic mean?

Back

A hypertonic solution has a higher concentration of solutes outside the cell than inside, causing water to move out of the cell.

Front

What is a hypotonic solution?

Back

A hypotonic solution has a lower concentration of solutes outside the cell than inside, leading to water moving into the cell.

Front

Define isotonic solution.

Back

An isotonic solution has equal concentrations of solutes inside and outside the cell, resulting in no net movement of water.

Front

What role do protein pumps play in active transport?

Back

Protein pumps are integral membrane proteins that use energy to transport molecules against their concentration gradient.

Front

What is the difference between diffusion and facilitated diffusion?

Back

Diffusion is the passive movement of molecules from high to low concentration, while facilitated diffusion requires specific protein channels to assist larger or polar molecules.

Front

How does temperature affect the rate of diffusion?

Back

Higher temperatures increase the kinetic energy of molecules, leading to a faster rate of diffusion.