CAS BI 108 Study Guide - Midterm Guide: Securin, S Phase, Chromosome
1 Apr 2016
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Document Summary
Chapter 6: structure of biological membrane, phospholipid bilayer: establishes physical integrity of the membrane, creates a barrier to the passage of hydrophilic materials. The monosaccharides on the outer surfaces can generate a large diversity of messages and form oligosaccharides of different shapes. The binding of these oligosaccharides with complementary shapes on adjacent cells is the basis of cell-cell adhesion: cholesterol: in animal cell membranes only. Preferentially associates with saturated fatty acids -- helps to pack it together and become less fluid. This, along with decreased temperature, reduces membrane fluidity: proteins: may be noncovalently embedded in the bilayer by hydrophobic regions, cannot penetrate the bilayer at all, or migrate within freely within the bilayer. Functions include moving materials through the membrane and receiving external chemical signals: two protein associations with cell membranes: Peripheral: lack exposed hydrophobic parts, cannot penetrate the bilayer.
