Honors Bio - Membranes and Transport

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 is osmosis?

Back

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

Front

What type of transport is osmosis classified as?

Back

Osmosis is classified as passive transport.

Front

What types of molecules can easily pass through a cell membrane?

Back

Small and hydrophobic molecules, such as CO2 and O2, can pass through a cell membrane most easily.

Front

What prevents a plant cell from bursting in a hypotonic solution?

Back

The cell wall prevents a plant cell from bursting in a hypotonic solution.

Front

What is facilitated diffusion?

Back

Facilitated diffusion is a type of passive transport that uses protein channels to help move molecules across the cell membrane.

Front

What is active transport?

Back

Active transport is the movement of molecules across a cell membrane from an area of low concentration to an area of high concentration, requiring energy.

Front

What is a selectively permeable membrane?

Back

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

Front

What is turgor pressure?

Back

Turgor pressure is the pressure of the cell contents against the cell wall in plant cells, helping maintain structure.

Front

What happens to a cell in a hypertonic solution?

Back

In a hypertonic solution, a cell loses water and may shrivel due to osmosis.