Macromolecules
-
Upload
ronan-mcintosh -
Category
Documents
-
view
48 -
download
0
description
Transcript of Macromolecules
![Page 1: Macromolecules](https://reader033.fdocuments.net/reader033/viewer/2022061607/56812aa0550346895d8e63bd/html5/thumbnails/1.jpg)
Macromolecules
The building blocks of life…
![Page 2: Macromolecules](https://reader033.fdocuments.net/reader033/viewer/2022061607/56812aa0550346895d8e63bd/html5/thumbnails/2.jpg)
Macromolecules
Cells are composed of several types of biological macromolecules.
These function as energy-storage molecules, structural components, and in information storage, and are primarily composed of carbon, hydrogen and oxygen.
![Page 3: Macromolecules](https://reader033.fdocuments.net/reader033/viewer/2022061607/56812aa0550346895d8e63bd/html5/thumbnails/3.jpg)
Carbohydrates
carbon, hydrogen & oxygen in a 1:2:1 ratio exist as monosaccharides, disaccharides
and polysaccharides among the most abundant molecules on
Earth
![Page 4: Macromolecules](https://reader033.fdocuments.net/reader033/viewer/2022061607/56812aa0550346895d8e63bd/html5/thumbnails/4.jpg)
Monosaccharides
“single sugars” general formula is
(CH2O)n
glucose (top) and ribose (bottom) are monosaccharides
O
OH
HH
H
OH
OH
H OH
H
OH
O H
OHH
OH
H
OH
H
OH
![Page 5: Macromolecules](https://reader033.fdocuments.net/reader033/viewer/2022061607/56812aa0550346895d8e63bd/html5/thumbnails/5.jpg)
Disaccharides
“double sugars” formed by dehydration synthesis from two
monosaccharides sucrose, maltose, and lactose are all
disaccharides
![Page 6: Macromolecules](https://reader033.fdocuments.net/reader033/viewer/2022061607/56812aa0550346895d8e63bd/html5/thumbnails/6.jpg)
Synthesis of MaltoseO
OH
HH
H
OH
OH
H OH
H
OH
O
OH
HH
H
OH
OH
H OH
H
OH
O
OH
HH
H
OH
H OH
H
OH
O
O
HH
H
OH
OH
H OH
H
OH
-glucose - glucose
maltose
![Page 7: Macromolecules](https://reader033.fdocuments.net/reader033/viewer/2022061607/56812aa0550346895d8e63bd/html5/thumbnails/7.jpg)
Polysaccharides
straight or branched chains of monosaccharides connected by glycosidic linkages
storage (e.g. starch, glycogen) or structural (e.g. cellulose, chitin)
![Page 8: Macromolecules](https://reader033.fdocuments.net/reader033/viewer/2022061607/56812aa0550346895d8e63bd/html5/thumbnails/8.jpg)
Polysaccharide Structure
![Page 9: Macromolecules](https://reader033.fdocuments.net/reader033/viewer/2022061607/56812aa0550346895d8e63bd/html5/thumbnails/9.jpg)
Proteins
proteins are chains of amino acids connected by peptide linkages
order of amino acids for a particular protein is determined by the gene which codes for it
![Page 10: Macromolecules](https://reader033.fdocuments.net/reader033/viewer/2022061607/56812aa0550346895d8e63bd/html5/thumbnails/10.jpg)
Amino Acid Structure
all amino acids have the same basic structure
“R” group is different for each amino acid
NH2
H
R
O
OH
carboxyl group
amino group
![Page 11: Macromolecules](https://reader033.fdocuments.net/reader033/viewer/2022061607/56812aa0550346895d8e63bd/html5/thumbnails/11.jpg)
Peptide Linkages
O
NH2
SH
N
O
OHH
O
NH2
SH OH
O
NH2OH
peptide linkage
cysteine glycine
![Page 12: Macromolecules](https://reader033.fdocuments.net/reader033/viewer/2022061607/56812aa0550346895d8e63bd/html5/thumbnails/12.jpg)
Levels of Protein Structure
Primary the specific sequence
of amino acids coded by DNA
![Page 13: Macromolecules](https://reader033.fdocuments.net/reader033/viewer/2022061607/56812aa0550346895d8e63bd/html5/thumbnails/13.jpg)
Secondary the folding or coiling
of the amino acid chain
caused by interactions between “R” groups
-Helix -Pleated Sheet
![Page 14: Macromolecules](https://reader033.fdocuments.net/reader033/viewer/2022061607/56812aa0550346895d8e63bd/html5/thumbnails/14.jpg)
Tertiary the unique three-
dimensional shape of the protein
enzymes are globular proteins
collagen is a fibrous protein
![Page 15: Macromolecules](https://reader033.fdocuments.net/reader033/viewer/2022061607/56812aa0550346895d8e63bd/html5/thumbnails/15.jpg)
Quaternary interactions between
separate polypeptide chains, or “subunits”
hemoglobin is composed of four subunits
![Page 16: Macromolecules](https://reader033.fdocuments.net/reader033/viewer/2022061607/56812aa0550346895d8e63bd/html5/thumbnails/16.jpg)
Lipids lipids are a group of hydrophobic
molecules “neutral fats” are uncharged lipids
composed of glycerol and fatty acids fats are solid at room temperature oils are liquid at room temperature steroids and phospholipids are amphiphilic
![Page 17: Macromolecules](https://reader033.fdocuments.net/reader033/viewer/2022061607/56812aa0550346895d8e63bd/html5/thumbnails/17.jpg)
Steroid Structure
steroids all have the same basic structure of four fused hydrocarbon rings
cholesterol is used to synthesize many other steroids in the body
CH3
OH
CH3
CH3
CH3
CH3
cholesterol
![Page 18: Macromolecules](https://reader033.fdocuments.net/reader033/viewer/2022061607/56812aa0550346895d8e63bd/html5/thumbnails/18.jpg)
Phospholipid Structure
glycerol backbone has two fatty acids and one charged inorganic phosphate group attached
primary component of cell membranes
![Page 19: Macromolecules](https://reader033.fdocuments.net/reader033/viewer/2022061607/56812aa0550346895d8e63bd/html5/thumbnails/19.jpg)
Triglycerides triglycerides are neutral fats glycerol is the “backbone” molecule fatty acids attach to glycerol by ester
linkages saturated fatty acids have no double
bonds between carbons unsaturated fatty acids have at least one
double bond between carbons
![Page 20: Macromolecules](https://reader033.fdocuments.net/reader033/viewer/2022061607/56812aa0550346895d8e63bd/html5/thumbnails/20.jpg)
Triglyceride Synthesis
OH
OH
OH
CH3
O
OH
CH3
O
OH
CH3
O
OH
O
O
O
O
O
O
CH3
CH3
CH3
glycerol3 fatty acids
ester linkage
triglyceride
![Page 21: Macromolecules](https://reader033.fdocuments.net/reader033/viewer/2022061607/56812aa0550346895d8e63bd/html5/thumbnails/21.jpg)
Nucleic Acids
Deoxyribonucleic Acid (DNA) and Ribonucleic Acid (RNA)
composed of nitrogen-containing “bases” attached to a backbone of alternating pentose sugars and inorganic phosphate
function in information storage (DNA) and transfer (RNA)
![Page 22: Macromolecules](https://reader033.fdocuments.net/reader033/viewer/2022061607/56812aa0550346895d8e63bd/html5/thumbnails/22.jpg)
“Bases” of DNA & RNAPurines Pyrimidines
adenine thymine
guanine cytosine
uracil
N
NN
NH
NH2
N
NHN
NH
NH2
O
NH
NHCH3
O
O
NH
N
NH2
O
NH
NH
O
O
![Page 23: Macromolecules](https://reader033.fdocuments.net/reader033/viewer/2022061607/56812aa0550346895d8e63bd/html5/thumbnails/23.jpg)
DNA deoxyribose sugar adenine, guanine, cytosine, thymine bases arranged in a double helix
![Page 24: Macromolecules](https://reader033.fdocuments.net/reader033/viewer/2022061607/56812aa0550346895d8e63bd/html5/thumbnails/24.jpg)
RNA ribose sugar adenine, guanine, cytosine, uracil bases single-stranded
![Page 25: Macromolecules](https://reader033.fdocuments.net/reader033/viewer/2022061607/56812aa0550346895d8e63bd/html5/thumbnails/25.jpg)
References MIT Biology Hypertextbook(1996)
http://esg-www.mit.edu:8001/esgbio/lm/sugars/sugars.html (3/9/2001)
Farabee, M.J., (2001) An Online Biology Book. Chemistry 2: Water and Organic Molecules http://gened.emc.maricopa.edu/bio/bio181/BIOBK/BioBookCHEM2.html (3/9/2002)
A.C.D. Labs (2002) ChemSketch (Freeware), available for download at http://www.acdlabs.com/. Used for molecular structure diagrams.