Unit 1 Key Terms & LOs.docx

Unit 1 Key Terms & LOs.docx - Unit 1 Learning...

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Unit 1 Learning Objectives: Cell Membranes and Enzymes You should be able to: Know the difference between saturated and unsaturated fatty acids 1. Saturated single carbon carbon-carbon bond 2. Unsaturated- double carbon bond Be able to describe and recognize the structures of the three types of lipids o Steroids Bulky ring o Fats Three fatty acids linked to glycerol non polar o Phospholipids Glycerol linked to Phosphate group and two hydrocarbon tails Describe the types of lipids that are found in membranes o Membrane- forming lipid Amphipathic Micelle- round Bilayer- phospholipids two hydrocarbon tail SPONTANEUOS Describe why the lipid bilayer is structured the way that it is o Amphipathic Know what molecules can pass readily through a selectively permeable membrane and apply that information with given a new molecule. o High Permeability o Small non polar easy O2 CO2 N2 o Small uncharged polar molecules H2O o Large uncharged polar molecules Glucose o Ions Na+ Cl- o Low permeability Be able to describe ways to change membrane permeability and fluidity o Increased Fluidity= increased permeability o Unsaturated fatty acids increase fluidity and permeability (kinks) o Longer tails= less fluid and less permeable o Short and unsaturated= higher permeability and fluidity o Long and saturated = lower permeability and fluidity
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o Cholesterol reduces membrane permeability o High and moderate temp= decreased fluidity o Low temp= increases fluidity Understand the process of diffusion had how concentration gradients play a role in this process.
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  • Fall '08
  • McCletchie
  • Biology

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