Cell Membrane

Front

What role does cholesterol play in the plasma membrane?

Back

Cholesterol prevents the fatty acid tails of phospholipids from sticking together, maintaining membrane fluidity.

Front

What is the hydrophobic region of the cell membrane?

Back

The hydrophobic region consists of the fatty acid tails of phospholipids, which repel water.

Front

Define hydrophilic.

Back

Hydrophilic means 'water-loving' and refers to molecules that are attracted to water.

Front

What are the main components that form channels and pumps in the phospholipid bilayer?

Back

Proteins form the channels and pumps in the phospholipid bilayer.

Front

What is the primary function of the plasma membrane?

Back

The primary function of the plasma membrane is to regulate what enters and leaves the cell.

Front

What are phospholipids and their role in the cell membrane?

Back

Phospholipids are molecules that make up the bilayer of the cell membrane, with hydrophilic heads and hydrophobic tails.

Front

Explain the fluid mosaic model of the cell membrane.

Back

The fluid mosaic model describes the cell membrane as a flexible layer made of lipid molecules with proteins embedded, allowing for movement and interaction.

Front

What is the significance of membrane proteins?

Back

Membrane proteins are crucial for various functions, including transport, signaling, and structural support.

Front

How do integral proteins differ from peripheral proteins?

Back

Integral proteins span the membrane and are involved in transport, while peripheral proteins are attached to the surface and assist in signaling.

Front

What is selective permeability in the context of the plasma membrane?

Back

Selective permeability refers to the ability of the plasma membrane to allow certain substances to pass while blocking others.