BIOL 1000 Lecture Notes - Lecture 5: Desert Iguana, Glycerol, Fluid Mosaic Model
26 Aug 2018
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Chapter 5: membranes and transport up to 5. 2. Membrane functions: barrier to water-soluble (polar) molecules, charged molecules and large molecules. Membrane composition- on the outside of cells but on eukaryotes also on internal organelles. Types of phospholipids composing one monolayer differs from the other monolayer. Different phospholipids required for different jobs (cellular functions) Not a static structure, always moving --- can move laterally (side to side) spin on their own axis (roations) and fatty acid tails can move (flexion) slide 12. Membrane is not static; lots of movement occurs. Phospholipids do not stay in the same place; they move around. Fluid mosaic model: membrane is both fluid and mosaic. Most lipid can move rapidly and laterally within the membrane. Why mosaic: pri(cid:373)arily because of the diversity of protein types found in membrane, but there is di(cid:448)ersit(cid:455) i(cid:374) lipid a(cid:374)d (cid:272)ar(cid:271)oh(cid:455)drate as (cid:449)ell. The further apart lipids are from one another (but still touching) the more fluid the membrane is.
