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Plasma Membrane ~ Structure and Functions
Descripción
A brief outline of the structure and functions of the plasma membrane
Sin etiquetas
biology
as biology
ocr biology
plasma membrane
a level
Mapa Mental por
Lauren Goldson
, actualizado hace más de 1 año
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Creado por
Lauren Goldson
hace más de 8 años
171
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Resumen del Recurso
Plasma Membrane ~ Structure and Functions
Basic Purposes
present in both eukaryotic and prokaryotic cells
works as a barrier between the inner and outer surface of a cell
Animal Cells
Present in the outer most layer of the cell
Plant cells
Present just beneath the cell wall
Structure of the Plasma Membrane
Components
Proteins
Controls what enters and leaves the cell
Some form channels which allow small charged particles through
Carrier proteins transport large molecules and charged particles across the membrane through active transport and facilitated diffusion
Act as receptors for molecules (e.g. hormones) used in cell signalling)
Lipids like Glycolipid (Lipids with a carbohydrate attached)
attached to phospholipids along with the sugar chains
Phospholipid Bilayer
create a partially permeable membrane, which allows only certain substances to diffuse through the membrane.
The centre of the bilayer is hydrophobic so no water - soluble substances can dissolve through
Fat-soluble substances can dissolve straight through the membrane
Cholestorol
maintains the fluidity of cell surface membrane.
A type of lipid present in all cells (except bacterial)
They bind to the hydrophobic tail of phospholipds
Making the membrane less fluid due to being tightly packed
Has hydrophobic sections making a further barrier for substances
Phospholipids
Water is a polar molecule but due to being small can diffuse by osmosis through the cell
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