Cell Transport

Front

What is osmosis?

Back

Osmosis is the movement 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 active transport?

Back

Active transport is the movement of substances across a cell membrane against their concentration gradient, requiring energy (ATP).

Front

What is facilitated diffusion?

Back

Facilitated diffusion is the process by which substances move across a cell membrane with the help of transport proteins, without the use of energy.

Front

What is simple diffusion?

Back

Simple diffusion is the movement of small or nonpolar molecules across a cell membrane from an area of higher concentration to an area of lower concentration without the use of energy.

Front

What is the concentration gradient?

Back

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

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.

Front

What role does ATP play in active transport?

Back

ATP provides the energy required for active transport to move substances against their concentration gradient.

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 an example of osmosis in living organisms?

Back

An example of osmosis is the absorption of water by plant roots from the soil.

Front

What happens to a cell in a hypertonic solution?

Back

In a hypertonic solution, water moves out of the cell, causing it to shrink.