Cell Transport Amoeba sisters

Front

What is facilitated diffusion?

Back

Facilitated diffusion is a process by which substances move across cell membranes with the help of transport proteins, following their concentration gradient without the use of energy.

Front

What is the role of the cell membrane in homeostasis?

Back

The cell membrane controls what enters and leaves the cell, thus maintaining a stable internal environment, known as homeostasis.

Front

What is simple diffusion?

Back

Simple diffusion is the movement of small or nonpolar molecules across the cell membrane directly, without the assistance of proteins, and down their concentration gradient.

Front

What is active transport?

Back

Active transport is the movement of substances against their concentration gradient, requiring energy (ATP) to move molecules from an area of lower concentration to an area of higher concentration.

Front

What are aquaporins?

Back

Aquaporins are specialized protein channels in the cell membrane that facilitate the rapid transport of water molecules into and out of the cell.

Front

What is the concentration gradient?

Back

The concentration gradient is the difference in the concentration of a substance across a space, which drives the movement of molecules from areas of high concentration to areas of low concentration.

Front

What is 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 is the difference between passive and active transport?

Back

Passive transport does not require energy and moves substances down their concentration gradient, while active transport requires energy to move substances against their concentration gradient.

Front

What is a selectively permeable membrane?

Back

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

Front

What is the function of transport proteins?

Back

Transport proteins assist in the movement of substances across the cell membrane, either by facilitating diffusion or by actively transporting molecules.