Cell Membrane and Transport

Front

What is the primary function of the cell membrane?

Back

To protect the cell and regulate what enters and exits.

Front

What are phospholipids?

Back

Molecules that make up the cell membrane, consisting of a hydrophilic (water-attracting) head and two hydrophobic (water-repelling) tails.

Front

Define diffusion.

Back

The movement of molecules from an area of high concentration to an area of low concentration.

Front

What is osmosis?

Back

The diffusion of water molecules across a selectively permeable membrane.

Front

What role do proteins play in the cell membrane?

Back

Proteins assist in transporting substances across the membrane and act as receptors for signaling.

Front

What is endocytosis?

Back

The process by which cells engulf external substances, bringing them into the cell.

Front

What is exocytosis?

Back

The process of vesicles fusing with the cell membrane to release their contents outside the cell.

Front

What is active transport?

Back

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

Front

What is the difference between passive and active transport?

Back

Passive transport does not require energy, while active transport does.

Front

What is a selectively permeable membrane?

Back

A membrane that allows certain molecules to pass through while blocking others.