Card Set Information
BIO Exam 2
What is the basic living, structural and functional unit of the body?
The principal parts of a cell are the:
plasma membrane, cytoplasm, cellular contents between the plasma membrane and nucleus and the nucleus
What surrounds and contains the cytoplasm of a cell?
What is the membrane composed of?
proteins and lipids
On the fluid mosaic model, the membrane is a mosaic of proteins that
float like icebergs in a lipid bilayer sea
The lipid bilayer consists of:
2 back to back layers of phospholipids, cholesterol and glycolipids
The bilayer arrangements occur because:
the lipids are amphithatic, having poloar and nonpolar parts
extend into or through the lipid bilayer
Peripheral proteins associate with:
membrane lipids or integral proteins at the inner or outer surface of the membrane
Many integral proteins are glycoproteins, with sugar groups attached to the ends that face the extracellular fluid, together with glycolipids,
the glycoproteins form a glycocalyx on the extracellular surface of cells
Integral proteins are:
channels and carriers that help specific solutes across the membrane
Receptors serve as
cellular recognition sites
catalyze specific chemical reactions
Linkers (membrane proteins)
anchor proteins in the plasma membranes to protein filaments inside and outside the cell
Peripheral proteins serve as enzymes and linkers and
support the plasma membrane, anchor integral proteins.
Membrane glycoproteins function as
cell identity markers