Cell Transport

Front

What is facilitated diffusion?

Back

Facilitated diffusion is the process by which molecules move across a cell membrane through protein channels, without the use of energy, from an area of higher concentration to an area of lower concentration.

Front

What is osmosis?

Back

Osmosis is the movement of water molecules through a selectively permeable membrane from an area of high water concentration to an area of low water concentration.

Front

How do protein pumps function in cell transport?

Back

Protein pumps are integral membrane proteins that use energy (usually from ATP) to transport molecules against their concentration gradient, from an area of lower concentration to an area of higher concentration.

Front

What role do proteins play in cell membrane transport?

Back

Proteins facilitate the transport of substances across the cell membrane, including large molecules that cannot pass through the lipid bilayer directly.

Front

What is the difference between facilitated diffusion and active transport?

Back

Facilitated diffusion is a passive process that does not require energy, while active transport requires energy to move substances against their concentration gradient.

Front

What is the function of the cell membrane in maintaining homeostasis?

Back

The cell membrane regulates the movement of substances in and out of the cell, helping to maintain a stable internal environment.

Front

What types of molecules typically require facilitated diffusion to cross the cell membrane?

Back

Large or polar molecules, such as glucose and ions, typically require facilitated diffusion to cross the cell membrane.

Front

What is a selectively permeable membrane?

Back

A selectively permeable membrane is a barrier that allows certain substances to pass through while blocking others, thus controlling the movement of materials in and out of the cell.

Front

What is the concentration gradient?

Back

The concentration gradient is the difference in concentration of a substance between two areas, which drives the movement of molecules during diffusion.

Front

What is the significance of ATP in active transport?

Back

ATP provides the energy required for active transport processes, allowing molecules to be moved against their concentration gradient.