Cell Membrane & Cell Transport

Front

What is osmosis?

Back

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

Front

What does it mean for a membrane to be selectively permeable?

Back

A selectively permeable membrane allows some molecules to cross while others cannot.

Front

What are phospholipids?

Back

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

Front

How do cells maintain homeostasis?

Back

Cells maintain homeostasis by regulating what enters and leaves the cell.

Front

What types of particles can diffuse through the phospholipid bilayer?

Back

Oxygen and carbon dioxide can diffuse through the phospholipid bilayer.

Front

What is the role of the cell membrane?

Back

The cell membrane protects the cell and regulates the movement of substances in and out of the cell.

Front

Define diffusion.

Back

Diffusion is the process by which molecules spread from areas of high concentration to areas of low concentration.

Front

What is the difference between passive and active transport?

Back

Passive transport does not require energy and moves substances down their concentration gradient, while active transport requires energy to move substances against their concentration gradient.

Front

What is facilitated diffusion?

Back

Facilitated diffusion is a type of passive transport that uses transport proteins to help move molecules across the membrane.

Front

What is the significance of the fluid mosaic model?

Back

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