lecture04 - Biology 172 Lecture 4: Wed, May 12, 2010 Todays...

Info iconThis preview shows pages 1–19. Sign up to view the full content.

View Full Document Right Arrow Icon
Lecture 4: Wed, May 12, 2010 Biology 172 Today’s Outline Announcements • Tomorrow’s Discussion : Detergents. Meet in Chem 1640. Quiz on today’s lecture Lipids Biological Membranes - Fluid mosaic model - Membrane structure Transport Across Membranes - Passive Transport Simple diffusion Facilitated diffusion - Active Transport Cell Structure - Prokaryotic Vs. Eukaryotic cells - Structures in All Cells
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Fats Phospholipids Steroids Lipids Not polymers Mostly composed of hydrocarbon Mostly hydrophobic Fuel storage, membranes, hormones
Background image of page 2
Fats Contain Fatty Acids fatty acids may be saturated (no double bonds) or unsaturated (with double bond(s)) fatty acids are hydrocarbon chains with terminal carboxyl group
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Synthesis = condensation (dehydration) reaction Ester linkage between glycerol and a fatty acid Figure 6.3a Fat = glycerol linked by ester linkages to 3 fatty acids
Background image of page 4
Triglycerides = Triacylglycerol = Fats Figure 6.3b
Background image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Saturation: abundance of double- bonds in fatty acids determines fluidity Saturated fats (fewer double bonds; more hydrogens) are solid at room temperature Unsaturated fats (more double bonds; fewer hydrogens) are liquid (oils) = more fluid double bond single bond
Background image of page 6
Background image of page 7

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Artificially ‘bombarding’ an unsaturated fat with hydrogen atoms converts naturally occurring cis double bonds to trans double bonds. Trans Fats. ...
Background image of page 8
like triacylglycerides, but phosphate-containing compound replaces one fatty acid have a polar part (hydrophilic head) and a non-polar part (hydrophobic tail) major component of membranes Phospholipids
Background image of page 9

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Phospholipids Phospholipid Polar head (hydrophilic) Nonpolar tail (hydrophobic) Figure 6-4b glycerol
Background image of page 10
Phospholipids make membranes! Polar head Non-polar tail Two instead of three } Amphipathic = both hydrophilic and hydrophobic regions
Background image of page 11

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Phospholipid Bilayers In water, phospholipids can form micelles or lipid bilayers with the polar phosphate “heads” facing outward and the hydrophobic fatty acid “tails” facing inward toward other tails.
Background image of page 12
Fig. 6.5
Background image of page 13

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Phospholipids assemble into lipid bilayers Figure 6-5b
Background image of page 14
Lipids Fats Phospholipids Steroids cholesterol, vit D
Background image of page 15

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Found in membranes, stabilizes the membrane Cholesterol 4 ring structure polar
Background image of page 16
BIOLOGICAL MEMBRANES Fluid Mosaic Model: Membrane Structure Transport Across Membranes Passive Transport Active Transport
Background image of page 17

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
structures that provide permeability barriers for the cell Biological Membranes composed of lipid bilayers (mostly phospholipids) monolayer bilayer
Background image of page 18
Image of page 19
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 09/13/2010 for the course BIO 172 taught by Professor Clark during the Spring '08 term at University of Michigan.

Page1 / 51

lecture04 - Biology 172 Lecture 4: Wed, May 12, 2010 Todays...

This preview shows document pages 1 - 19. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online