KEY CONCEPT The ____ ________ is a _______ that _________ a cell from the ________ __________.

Cell membranes are composed of ___ ____________ ______. The cell membrane has ___ _____ _________. forms a ________ between ______ and _______ of the ___ controls _______ of _________ cell membrane outside cell inside cell

Cell membranes are composed of two phospholipid layers. The cell membrane is made of a phospholipid bilayer. There are other _________ ________ in the ________. The _____ ______ _____ describes the membrane. cell membrane protein cholesterol carbohydrate chain protein channel

Cell membranes are composed of two phospholipid layers. The cell membrane is ___________ _________. Some molecules can cross the membrane while others cannot.

_________ _______ are ___________ across the ____ ________. _________ bind with _______ and change _____. There are ___ _____ of ________. ____________ receptor

Chemical signals are transmitted across the cell membrane. Receptors bind with ligands and change shape. There are two types of receptors. intracellular receptor ________ receptor