What do cell surface membrane surround?
Cells
What does partially permeable mean?
It allows some molecules through but not others
What are the 3 ways that substances can move through a cell surface membrane?
Diffusion, osmosis and active transport
What is another name for the cell surface membrane?
Plasma membrane
What are cell membranes composed of?
Mainly phospholipids + some other lipids, proteins and carbohydrates (attatched to proteins/lipids)
What is the name of the arrangement of a cell surface membrane?
Fluid mosaic model
Why is it a "fluid" mosaic model?
The phospholipids in the continuous double bi-layer are constantly moving
Why is it a fluid "mosaic" model?
Proteins are scattered across the bi-layer like tiles in a mosaic.
Which types of protein allow substances to travel through the membrane?
Channel proteins and carrier proteins
What do receptor proteins do?
Allow the cell to detect chemicals released from other cells
What happens when insulin hormone binds to receptor proteins in liver cells?
The cell is told to absorb glucose
How thick is the phospholipid bilayer?
7nm
What are proteins with carbohydrates attached to them called on the cell membrane?
Glycoproteins
What are lipids with carbohydrates attached to them called on the cell membrane?
Glycolipids
Which part of the phospholipid is hydrophillic?
The head
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