Only SOME cells have an extra protective layer called

The cell wall is only found in

The cell membrane is made of a _________________ that allows materials IN and OUT of the cell.

The bilayer of the cell membrane is made of

Lipids (phospholipids) are made of a _______________ head and a _______________ tail.

The word hydrophilic means-

The word hydrophobic means-

All of the following are materials that make up the cell membrane EXCEPT:

The cell membrane is often described as a fluid _________.

If a substance is able to cross a membrane, the membrane is said to be

A membrane is _____________ to substances that CANNOT pass through it.

Most biological membranes are _______________ - meaning that some substances can pass and others cannot.

Passive transport is cell transport that

Active transport is cell transport that

In endocytosis, materials move _____ to the cell.

In exocytosis, materials move _____ of the cell.