Cell Membrane Structure and Passive 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 form the bilayer of the cell membrane, consisting of a hydrophilic (water-attracting) head and two hydrophobic (water-repelling) tails.

Front

What is the fluid mosaic model?

Back

A model that describes the structure of the cell membrane as a mosaic of various proteins that float in or on the fluid lipid bilayer.

Front

What role do proteins play in the cell membrane?

Back

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

Front

What is passive transport?

Back

The movement of substances across a cell membrane without the use of energy, typically along the concentration gradient.

Front

Define diffusion.

Back

The process by which molecules spread from areas of high concentration to areas of low concentration.

Front

What is osmosis?

Back

The diffusion of water molecules through a selectively permeable membrane.

Front

What is a selectively permeable membrane?

Back

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

Front

What is the difference between active and passive transport?

Back

Active transport requires energy to move substances against their concentration gradient, while passive transport does not.

Front

What is the hydrophilic region of a phospholipid?

Back

The 'head' of the phospholipid that is attracted to water.