Cell Transport

Front

What is passive transport?

Back

Passive transport is the movement of substances across a cell membrane without the use of energy, occurring naturally from areas of high concentration to low concentration.

Front

What is active transport?

Back

Active transport is the movement of substances across a cell membrane that requires energy, usually against a concentration gradient.

Front

What is simple diffusion?

Back

Simple diffusion is the process by which small molecules move directly through the phospholipid bilayer of a cell membrane from an area of high concentration to an area of low concentration.

Front

What is osmosis?

Back

Osmosis is the diffusion of water molecules through a selectively permeable membrane from an area of low solute concentration to an area of high solute concentration.

Front

What is facilitated diffusion?

Back

Facilitated diffusion is the process by which larger or polar molecules pass through the cell membrane with the help of transport proteins, moving from high to low concentration without energy.

Front

What are phospholipids?

Back

Phospholipids are molecules that make up the cell membrane, consisting of a hydrophilic (water-attracting) 'head' and two hydrophobic (water-repelling) 'tails'.

Front

How many layers of phospholipids are in the cell membrane?

Back

The cell membrane is made up of two layers of phospholipids, known as the phospholipid bilayer.

Front

What is the role of transport proteins in the cell membrane?

Back

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

Front

What is the hydrophobic region of the cell membrane?

Back

The hydrophobic region of the cell membrane refers to the fatty acid tails of phospholipids, which repel water and create a barrier to water-soluble substances.

Front

What is the hydrophilic region of the cell membrane?

Back

The hydrophilic region of the cell membrane refers to the phosphate heads of phospholipids, which are attracted to water and face the aqueous environment inside and outside the cell.