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1. Lipids (non-polar)
 They prevent the cell from
dissolving in its environment
 Ex: (fatty acid tails) maintains
the structure of the cell and
hence, us!
a. Phospholipids: A fatty acid
tail (non-polar) attached to
one phosphate group (polar)
- Heads: Phosphates
(polar)
- Tails: Lipids (non-polar)
2. Cholesterol
 Function- Prevents fatty
acid tails from sticking
together
 Location- between fatty
acid tails
3. Proteins
 Aid in the transport of
molecules in and out of
cell; function as
receptors allow intercellular communication
and recognition of cell
type; facilitate chemical
reactions (enzymes)
 Location- traverse the
entire membrane or one
half.
 Ex: transport protein
a. Enzymes: type of
protein that
facilitates chemical
activity in the cell
b. Speed up chemical
reactions; breaks
down molecules;
synthesis of new
molecules.
4. Carbohydrate
 Act as receptors to other
glucose molecules and
helps guide hormones to
the proper cells.
 Ex: glycoprotein
(attached to a protein)
5. Cell Membrane
 Made up of- primarily
proteins and
phospholipids
 Selective Permeabilityallows only some
substances to pass
through.