Terms in this set (10)
Non-polar, not attracted to water.
Polar, attracted to water.
The plasma membrane is composed mostly of a phospholipid bilayer. Phospholipid molecules form bilayers in water because they have amphipathic properties- 2 different behaviours in water. Membranes can self organise because the non polar lipids spontaneously aggregate and form a layer away from the water (on the inside) and the polar phosphate heads are attracted to the water.
Membrane Protein Functions
They are diverse in their structure, function and position in the membrane.
-Transport other molecules through the membrane.
-Act as enzymes.
Position of Integral Proteins
Embedded within the membrane. Surface contains hydrophobic regions that interact with the hydrophobic layer of the membrane. Most pass completely through the membrane.
Position of Peripheral Proteins
Anchored on the side of the membrane, but does not interact with the hydrophobic core of the membrane. Usually bound to the membrane indirectly by attaching to integral proteins or directly by attaching to the polar heads of the phospholipids.
Position of Glycoproteins
Sugar can be attached to the outer surface of the membrane proteins, they have diverse functions, such as acting as receptors or anchoring cells.
Component of animal membrane structures. It is a lipid, with a large hydrophobic region and a small hydrophilic end. Its rigid ring system is hydrophobic and polar hydroxyl is hydrophilic. It reduces the fluidity of the membrane and permeability to water soluble substances. It also prevents the membrane from freezing by preventing the close packing of fatty acids.
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