Mrs Disney Y10- Biology Transport across cell membranes

Front

What happens to cells when a person drinks salty water?

Back

Cells shrink due to water moving out of the cell to balance the salt concentration.

Front

What is the process called when water diffuses across a membrane?

Back

Osmosis.

Front

During osmosis, how does water move?

Back

Water moves from an area of high concentration to an area of low concentration.

Front

What happens to a cell when water moves out of it during osmosis?

Back

The cell shrinks.

Front

What is required for active transport in cells?

Back

Energy.

Front

Define osmosis.

Back

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

Front

What is a selectively permeable membrane?

Back

A membrane that allows certain molecules to pass through while blocking others.

Front

What is the difference between passive and active transport?

Back

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

Front

What is diffusion?

Back

Diffusion is the movement of particles from an area of high concentration to an area of low concentration.

Front

What role do proteins play in cell membranes?

Back

Proteins help transport substances across the cell membrane and can act as channels or carriers.