Cell Membranes and Transport

Front

What is the function of a cell membrane?

Back

The cell membrane controls what enters and exits the cell, providing protection and support.

Front

Define diffusion.

Back

Diffusion is the movement of particles from an area of higher concentration to an area of lower concentration.

Front

What is osmosis?

Back

Osmosis is the diffusion of water across a selectively permeable membrane.

Front

What does selectively-permeable mean?

Back

Selectively-permeable means that the membrane allows certain substances to pass while blocking others.

Front

What is active transport?

Back

Active transport is the movement of substances against their concentration gradient, requiring energy.

Front

What is the phospholipid bilayer?

Back

The phospholipid bilayer is a double layer of phospholipids that makes up the cell membrane.

Front

What role do proteins play in the cell membrane?

Back

Proteins in the cell membrane assist in transport, act as receptors, and provide structural support.

Front

What is the difference between passive and active transport?

Back

Passive transport does not require energy, while active transport requires energy to move substances.

Front

What is endocytosis?

Back

Endocytosis is the process by which cells take in substances by engulfing them.

Front

What is exocytosis?

Back

Exocytosis is the process by which cells expel materials in vesicles.