3.3 Cell Membrane

Front

What is the primary function of the cell membrane?

Back

The protective outer layer that controls what enters and leaves the cell.

Front

What does the Fluid Mosaic Model describe?

Back

The arrangement of the cell membrane as bendable and made of many parts.

Front

What is endocytosis?

Back

The process by which cells engulf substances from outside the cell membrane.

Front

What is exocytosis?

Back

The process by which cells expel substances through the cell membrane.

Front

What happens to water in a cell when placed in a hypertonic solution?

Back

Water moves out of the cell due to the high concentration of solutes outside.

Front

Define osmosis.

Back

The movement of water molecules across a selectively permeable membrane from an area of low solute concentration to an area of high solute concentration.

Front

What is a selectively permeable membrane?

Back

A membrane that allows certain substances to pass while blocking others.

Front

What role do proteins play in the cell membrane?

Back

Proteins help transport substances across the membrane and act as receptors for signaling.

Front

What is the significance of cholesterol in the cell membrane?

Back

Cholesterol helps to stabilize the membrane's fluidity and structure.

Front

Explain the term 'concentration gradient.'

Back

The difference in the concentration of a substance across a space or membrane.