Cell membrane and Diffusion

Front

What is the structure of a phospholipid?

Back

A phospholipid consists of a hydrophilic 'head' made of phosphate and two hydrophobic 'tails' made of fatty acids.

Front

What part of a phospholipid is hydrophilic?

Back

The phosphate 'head' is hydrophilic.

Front

What does hydrophobic mean?

Back

Hydrophobic means 'water fearing' and refers to substances that do not mix well with water.

Front

What is the role of cholesterol in the cell membrane?

Back

Cholesterol helps to stabilize the cell membrane's fluidity and structure.

Front

What are the main functions of proteins in the cell membrane?

Back

Proteins in the cell membrane assist in transport, act as receptors, and provide structural support.

Front

What is diffusion?

Back

Diffusion is the movement of molecules from an area of higher concentration to an area of lower concentration.

Front

What is a concentration gradient?

Back

A concentration gradient is the difference in the concentration of a substance across a space.

Front

What happens when equilibrium is reached in a solution?

Back

When equilibrium is reached, the concentration of molecules is equal throughout the space, and there is no net movement.

Front

What is homeostasis?

Back

Homeostasis is the process by which living organisms maintain a stable internal environment.

Front

What is osmosis?

Back

Osmosis is the diffusion of water across a selectively permeable membrane.