Chapter 5. Macromolecules
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Transcript of Chapter 5. Macromolecules
W-H
Chapter 5.
Macromolecules
W-H Based on work by K. Foglia
Macromolecules Smaller organic molecules join together
to form larger molecules macromolecules
4 major classes of macromolecules: carbohydrates lipids proteins nucleic acids
W-H Based on work by K. Foglia
Polymers Long molecules built by linking chain
of repeating smaller units polymers monomers = repeated small units covalent bonds
W-H Based on work by K. Foglia
How to build a polymer Condensation reaction
dehydration synthesis joins monomers by “taking” H2O out
1 monomer provides OH the other monomer provides H together these
form H2O requires energy
& enzymes
W-H Based on work by K. Foglia
How to break down a polymer Hydrolysis
use H2O to break apart monomers reverse of condensation reaction H2O is split into H and OH H & OH group attach where the covalent
bond used to be ex: digestion is
hydrolysis
W-H
Carbohydrates
W-H
So what’s all this talk about carbs?
Atkin’s DietSouth Beach Diet
W-H Based on work by K. Foglia
Carbohydrates Carbohydrates are composed of C, H, O
carbo - hydr - ateCH2O
(CH2O)x C6H12O6
Function: energy energy storage raw materials structural materials
Monomer: sugars ex: sugars & starches
W-H Based on work by K. Foglia
Sugars Most names for sugars end in -ose Classified by number of carbons
6C = hexose (glucose) 5C = pentose (fructose, ribose) 3C = triose (glyceraldehyde)
W-H Based on work by K. Foglia
What functional groups?
carbonyl
ketone
aldehyde
hydroxyl
W-H Based on work by K. Foglia
Sugar structure 5C & 6C sugars form rings in aqueous solutions
in cells!
Carbons are numbered
W-H Based on work by K. Foglia
Numbered carbons
C
CC
C
CC
1'
2'3'
4'
5'6'
O
W-H Based on work by K. Foglia
Simple & complex sugars Monosaccharides
simple 1 monomer sugars glucose
Disaccharides 2 monomers sucrose
Polysaccharides large polymers starch
W-H Based on work by K. Foglia
Building sugars Dehydration synthesis
|glucose
|glucose
glycosidic linkage
monosaccharides disaccharide
|maltose
W-H Based on work by K. Foglia
Building sugars Dehydration synthesis
|fructose
|glucose
glycosidic linkage
monosaccharides disaccharide
|sucrose
structural isomers
W-H Based on work by K. Foglia
Polysaccharides Polymers of sugars
costs little energy to build easily reversible = release energy
Function: energy storage
starch (plants) glycogen (animals)
building materials = structure cellulose (plants) chitin (arthropods & fungi)
W-H Based on work by K. Foglia
Branched vs linear polysaccharides
W-H Based on work by K. Foglia
Polysaccharide diversity Molecular structure determines function
isomers of glucose How does structure influence function…
W-H Based on work by K. Foglia
Digesting starch vs. cellulose
W-H Based on work by K. Foglia
Cellulose Most abundant organic compound
on Earth
W-H Based on work by K. Foglia
Glycemic index Which food will get into your
blood more quickly? apple rice cakes corn flakes bagel peanut M&M
W-H Based on work by K. Foglia
Glycemic index Ranking of carbohydrates based on their
immediate effect on blood glucose (blood sugar) levels
Carbohydrate foods that breakdown quickly during digestion have the highest glycemic indices. Their blood sugar response is fast & high.
W-H Based on work by K. Foglia
Glycemic index Which food will get into your
blood more quickly? apple 36 rice cakes 82 corn flakes 84 bagel 72 peanut M&M33
W-H
Let’s build some
Carbohydrates!