IB Biology HL SL Unit 3A

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"IB Biology HL SL Unit 3A"에 대한 내용입니다.

목차

1. Phospholipids form bilayers in water due to amphipathic properties of phospholipid molecules
2. Cholesterol in animal cell membranes reduces membrane fluidity and permeability of the membrane to some solutes like hydrophilic particles such as sodium and hydrogen ions
3. IB Questions

본문내용

Phospholipids form bilayers in water due to amphipathic properties of phospholipid molecules
- Hydrophilic phosphate head: attracted to water
- Hydrophobic hydrocarbon chain: not attracted to water
Therefore, phospholipids are amphipathic: having both of the properties
How to draw: hydrophobic hydrocarbon chains and a circle for hydrophilic phosphate head

Problems with Davson-Danielli model/ Singer and Nicolson Model
- One theory being superseded by another: evidence falsified the D-D model
- D-D model: proteins form distinct layer

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