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