Some molecules need the help of membrane proteins to move molecules from areas of high concentration to areas of low concentration.

What do the brown structures represent

Energy for active transport comes from the cells

The sodium-potassium pump requires energy to move ions across the cell membrane against their concentration gradient so it is a type of.....

Small polar molecules like O₂ and CO₂enter a cell through

Name small compartment enclosed by a membrane formed to transport of material during bulk transport.

A molecule composed of three basic parts:

A charged phosphate group

Glycerol

Two fatty acid chains

The arrangement of the molecules that make up a cell membrane

A property of cellular membranes that only allows certain molecules to enter or exit the cell.

Based on the diagram, what type of process occur?

Identify a peripheral protein

Small, nonpolar, hydrophobic molecules such as fatty acids

The fluid mosaic model describes a membrane consisting of

Which structure is the hydrophilic polar head of the phospholipid molecule?

Which structure is the hydrophobic tail of the phospholipid molecule?

The diagram shows three animal cells. Pairs of red circles represent oxygen molecules. Between which two cells is there the highest oxygen concentration gradient?

What may happen to red blood cells placed in pure water?