CHECKPOINT: Cell Membrane Structure and Function

Front

What is the primary function of proteins in the cell membrane?

Back

Proteins help move larger materials across the membrane.

Front

What does it mean when a membrane is described as 'selectively permeable'?

Back

It means that some molecules can cross the membrane while others cannot.

Front

What are the two layers that form the cell membrane?

Back

Phospholipids form the two layers of the cell membrane.

Front

What is the role of cholesterol in the cell membrane?

Back

Cholesterol prevents phospholipids from packing tightly together when cold and prevents them from separating during warm temperatures.

Front

What are the main components of the cell membrane?

Back

The main components are phospholipids, proteins, carbohydrates, and cholesterol.

Front

What is the structure of a phospholipid?

Back

A phospholipid consists of a hydrophilic (water-attracting) head and two hydrophobic (water-repelling) tails.

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 play roles in signaling.

Front

What is the function of carbohydrates in the cell membrane?

Back

Carbohydrates are involved in cell recognition and communication.

Front

What is the fluid mosaic model?

Back

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

Front

How does temperature affect the fluidity of the cell membrane?

Back

At lower temperatures, the membrane becomes less fluid as phospholipids pack tightly; at higher temperatures, it becomes more fluid.