The Plasma Membrane and Membrane Potential - Membrane Structure and Functions - The plasma membrane is a fluid lipid bilayer embedded with proteins
8 important questions on The Plasma Membrane and Membrane Potential - Membrane Structure and Functions - The plasma membrane is a fluid lipid bilayer embedded with proteins
What is the plasma membrane formally called and what are the 4 structural components to the plasma membrane?
lipids + proteins + carbohydrates + lipid rafts
What are the 2 chemical and structural regions of phospholipids, in the presence of what do phospholidids assemble and how? And that about phospholipids make them fluid?
chemical = Polar region & non polar region.The polar region is attracted to water and the non polar region is not becuase water is polar and not non polar molecule.
structural = phosphate head region and 2 fatty acid chains region
phospholipids assemble into a lipid bi-layer in the presence of water. The non polar end on the inside towards the ICF and the polar end on the outside towards the ECF
phospholipids are held together by weak chemical bonds therefore they can move places (fluidity)
Where is cholesterol found in the plasma membrane and what are the 2 reasons it is found in this particular location?
stops the packing and crystilisation of fatty acid chains to maintain fluidity & helps stabilise phospholipid position which increases the integrity of the bi-lipid membrane but also allows enough fluidity to enable it to change shape
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What are lipid rafts and what kind of protiens do they hold?
hold receptor proteins that respond to chemical messengers in the ECF and cause the cell to do a certain action
What do carbohydrates do (purpose) and where are they found in the plasma membrane?
What are carbohydrates connected to the protiens called in comparison to carbohydrates connected to lipids?
glycolipids
Where are membrane, integral/transmembrane and peripheral proteins found?
integral/transmembrane = reach the entire length of the lipid bilayer (therefore have polar/non polar parts)
peripheral = pinch into the lipid bilayer or attached to inner layer of the lipid bilayer where they are held by weak chemical bonds with the I/TM protiens
What does the plasma membrane appear like and why does it appear the way it does?
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