Biology Lesson: Cell Membranes

Front

What is the scientific name for the basic structure of a cell membrane?

Back

Phospholipid bilayer.

Front

What type of cell transport requires energy to move substances from low to high concentration?

Back

Active transport.

Front

What type of transport involves the movement of water across a membrane?

Back

Osmosis.

Front

What is the characteristic of the heads of a phospholipid molecule?

Back

They are attracted to water, causing them to face outwards.

Front

What model best represents the fluid-mosaic model of a cell membrane?

Back

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

Front

What are phospholipids composed of?

Back

Phospholipids are composed of a glycerol backbone, two fatty acid tails, and a phosphate group.

Front

What is passive transport?

Back

Passive transport is the movement of substances across a cell membrane without the use of energy, typically from an area of high concentration to an area of low concentration.

Front

What is the role of cholesterol in the cell membrane?

Back

Cholesterol helps to stabilize the fluidity of the cell membrane.

Front

What is endocytosis?

Back

Endocytosis is the process by which cells engulf substances from their external environment.

Front

What is exocytosis?

Back

Exocytosis is the process by which cells expel materials to the outside environment.