Unit 4 - Cellular Transport

Front

What is diffusion?

Back

Diffusion is the process by which molecules move from an area of higher concentration to an area of lower concentration due to their constant motion.

Front

What causes diffusion to occur?

Back

Diffusion occurs because molecules are always moving.

Front

What is active transport?

Back

Active transport is the movement of molecules across a cell membrane from a region of lower concentration to a region of higher concentration, requiring energy.

Front

Give an example of active transport.

Back

Endocytosis is an example of active transport.

Front

What is the hydrophobic region of the cell membrane?

Back

The hydrophobic region of the cell membrane is the part that repels water, typically made up of fatty acid tails.

Front

What does 'hydrophilic' mean?

Back

'Hydrophilic' means 'water loving', referring to substances that can interact with or dissolve in water.

Front

What does 'hydrophobic' mean?

Back

'Hydrophobic' means 'water fearing', referring to substances that do not interact with or dissolve in water.

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 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 do proteins play in cellular transport?

Back

Proteins in the cell membrane assist in transporting substances across the membrane, either passively or actively.