Cell Transport

Front

What is a selectively permeable membrane?

Back

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

Front

What is exocytosis?

Back

Exocytosis is the process by which a cell expels large quantities of materials, such as toxins and waste, by vesicles fusing with the plasma membrane.

Front

What happens to a cell placed in a hypotonic solution?

Back

When a cell is placed in a hypotonic solution, water enters the cell, causing it to swell and potentially burst due to the increased internal pressure.

Front

What is simple diffusion?

Back

Simple diffusion is the passive movement of molecules from an area of higher concentration to an area of lower concentration without the need for energy or transport proteins.

Front

What is endocytosis?

Back

Endocytosis is the process by which a cell engulfs external substances, such as bacteria, by enclosing them in a vesicle formed from the plasma membrane.

Front

What is the difference between active and passive transport?

Back

Active transport requires energy (ATP) to move substances against their concentration gradient, while passive transport does not require energy and moves substances along their concentration gradient.

Front

What role do transport proteins play in cell transport?

Back

Transport proteins facilitate the movement of substances across the cell membrane, either by providing a passageway for molecules to diffuse or by actively transporting them.

Front

What is osmosis?

Back

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

Front

What is the significance of the concentration gradient in cell transport?

Back

The concentration gradient is the difference in concentration of a substance across a space; it drives the movement of molecules during diffusion and osmosis.

Front

What is facilitated diffusion?

Back

Facilitated diffusion is a type of passive transport that uses transport proteins to help move molecules across the cell membrane without the use of energy.