Cell Membrane & Transport Flashcard (CP)

Front

What is the purpose of cholesterol in the cell membrane?

Back

Provide stability and regulate fluidity of the membrane.

Front

How do facilitated diffusion and protein pumps differ?

Back

Only protein pumps require energy to move molecules across a membrane.

Front

What is the main function of the cell membrane?

Back

Regulate what is transported into and out of the cell.

Front

What type of transport is facilitated diffusion?

Back

A process that allows molecules to cross the membrane with the help of a protein, without using energy.

Front

What process do some cells use to move large particles out of the cell?

Back

Exocytosis.

Front

Define passive transport.

Back

The movement of substances across a cell membrane without the use of energy.

Front

What is active transport?

Back

The movement of substances against their concentration gradient, requiring energy.

Front

What role do proteins play in the cell membrane?

Back

They assist in transporting materials across the membrane and facilitate communication between cells.

Front

What is the phospholipid bilayer?

Back

A double layer of phospholipids that makes up the cell membrane, providing a barrier to most water-soluble substances.

Front

Explain the concept of selective permeability.

Back

The ability of the cell membrane to allow certain substances to pass while blocking others.