Fluid mosaic model

The video explores the cell membrane, highlighting its structure and function. It introduces the fluid mosaic model, explaining how phospholipids, cholesterol, and proteins contribute to membrane fluidity and permeability. Phospholipids form a bilayer with hydrophilic heads and hydrophobic tails, while cholesterol regulates fluidity. Proteins facilitate transport and communication. The balance of fluidity ensures cell stability and controlled substance movement.

What is the primary function of the cell membrane?

• To synthesize proteins

• To store genetic information

• To hold the components of the cell inside and act as a protective barrier

• To produce energy for the cell

How do phospholipids arrange themselves in the cell membrane?

• In a single layer with heads facing inwards

• In a single layer with tails facing outwards

• In two layers with heads facing outwards and tails facing inwards

• In two layers with tails facing outwards and heads facing inwards

What property of phospholipid heads makes them hydrophilic?

• They are made of fatty acids

• They repel water

• They have a slight charge

• They are nonpolar

What role does cholesterol play in the cell membrane?

• It regulates the fluidity and permeability of the membrane

• It synthesizes proteins

• It provides energy for the cell

• It stores genetic information

Which type of protein is involved in cell recognition by the immune system?

• Integral proteins

• Peripheral proteins

• Glycoproteins

• Lipoproteins