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3016853
Membrane Structure
Descrição
Mind Map of Topic 1.3 Membrane Structure of IB Biology Chapter 1 Cell Biology
Sem etiquetas
membrane structure
cell biology
ib biology
Mapa Mental por
tiasabs
, atualizado more than 1 year ago
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tiasabs
quase 9 anos atrás
15
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Resumo de Recurso
Membrane Structure
Phospholipid bilayers
form in water due to amphipathic properties of phospholipid molecules
hydrophilic - attracted to water
phosphate group
hydrophobic - repelled by water
two hydrocarbon chains
amphipathic - substances part philic part phobic
phosphate heads
hydrocarbon tails
stable structures
formation
add water
philics all attracted
phobic repelled and attracted to each other
forms double layers
Membrane proteins
structure
integral proteins
transmembrane
mostly hydrophobic
embedded into hydrocarbon chains
peripheral proteins
mostly hydrophilic
single hydrocarbon chain anchoring protein to membrane surface
attached to integral proteins
position
proteins oriented to carry out function correctly
varying protein content of the membranes
function
form barrier though which ions and hydrophilic molecules cannot pass
hormone binding sites
immobilized enzymes
cell to cell communication
channels for passive transport
pumps for active transport
Cholesterol in membranes
component of animal cell membranes
type of lipid; not fat or oil
belongs to group steroids
mostly hydrohobic
one end has a hydroxyl- hydrophilic
positioned between phospholipids
amount in membrane varies
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