lect19_membranes

lect19_membranes - Announcements Isolation: Cell Membranes...

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1 Isolation: Cell Membranes Day 18 Bis2A Announcements • Smartsite – longer quiz (Membranes + prokaryotic cells) – for Friday • Synthesis Essay (100 pts) due 22 Nov – Details on Smartsite – I’ll post a Scientific American article (Hazen “Life’s Rocky Start”) that you may find helpful • Water is the universal medium of life • Water is also a universal solvent • How can living things keep their expensive machines from dissolving or drifting away? Problem: • Develop an insoluble membrane to keep things “in” and “out” What is the solution to this problem? • Draw a representation of the plasma membrane of a cell, using circles and lines to represent the two ‘ends’ of the phospholipids that comprise the membrane. Which of the following looks most like your own drawing (or looks correct, now that you see it)? A B C D Outside of Cell Outside of Cell Outside of Cell Outside of Cell Inside of Cell Inside of Cell Inside of Cell Inside of Cell
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2 What is the significance of the phosphate group in a phospholipid? • A. It lowers the molecule’s potential energy. • B. It phosphorylates the molecule, changing its conformation (shape). • C. It makes one end of the molecule water- loving. • D. It gives the molecule a bend or “kink.” Why do membranes form spontaneously in water? A.
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This note was uploaded on 03/08/2011 for the course BIS 2A taught by Professor Grossberg during the Fall '08 term at UC Davis.

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lect19_membranes - Announcements Isolation: Cell Membranes...

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