3.3 Cell Membrane

Forms a boundary between a cell and the outside environment

• plasma membrane

• phospholipid

• fluid mosaic model

• receptor

Consists of a double layer of phospholipids interspersed with a variety of of other other molecules

• glycerol

• phosphate group

• carbohydrate

• cell membrane

T or F: A cell membrane is the same as a plasma membrane.

• True

• False

Controls the passage of materials into and out of the cell

• phospholipid

• cell membrane

• intracellular receptor

• membrane receptor

Molecule composed of three basic parts

• phosphate group

• glycerol

• phospholipid

• fatty acid

Which is NOT a basic part of a phospolipid:

• charged phosphate group

• two fatty acid chains

• centrome

• glycerol

What two parts form the head of a phospholipid?

• glycerol & phosphate group

• fatty acid chains & phosphate group

• glycerol & fatty acid chains

Because the phospholipid head bears a charge, it is called

• an electric force

• nonpolar

• polar

• an electron

Heads of phospholipids form _________ bonds with water molecules.

• oxygen

• nitrogen

• polar

• hydrogen

Fatty acid tails are ______________ , so they repel __________.

• polar / hydrogen

• polar / water

• nonpolar / hydrogen

• nonpolar / water