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27909785
Cell membranes
Description
AS level Biology OCR Mind Map on Cell membranes, created by lily wilson on 08/12/2020.
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bio
membranes
biology ocr
as level
Mind Map by
lily wilson
, updated more than 1 year ago
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Created by
lily wilson
over 3 years ago
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Resource summary
Cell membranes
PLASMA membranes
barrier, control what enters and leaves cell
partially permiable
what gives cell membranes their different properties?
phospholipid
they have a hydropillic head and a hydrophobic tail
they form a bilayer
the centre is hydrophobic preventing water from entering or leaving
fat soluble substances can enter
cholesterol
lipid, present in all cell membranes but bacterial cell membranes
fit between phospholipids, making the membrane more rigid
glycolipids and protiens
Cell membrane permiablity
temperature
diffusion
net movement of particles from higher to lower concentration dow the concentration gradient
happens over phospholipid bilayer
how to increase the rate of diffusion
steeper conc gradient
thinner exchange surface
increased temperature
larger s.a
Media attachments
Screenshot+2020 12 08+At+15.39.16 (binary/octet-stream)
Screenshot+2020 12 08+At+15.39.31 (binary/octet-stream)
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