BIO 156 Ch 3 Organic Molecules of Life

BIO 156 CH 3

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Organic chemistry
Biological molecules
organic molecules
Organic molecules
Structural materials
contain carbon and hydrogen
Inorganic molecules
Do not (H20 and NaCI)
Carbon atom
Total of 6 electrons---- 4 in outer shell
almost always share electrons with elements such as hydrogn, nitrogen, and oxygen
caan bond with as many as 4 other elelments
most often shares electrons with other carbon atoms
Types of carbon atoms
Hydrocarbons
isomers
Hydorcarbons
Chains of carbon atoms bonded only to hydrogen atom
Isomers
Same number and kinds of atoms in a variety of arrangements
may have different properties
Carbon skeleton and functional groups
Size and shape of carbon skeleton or backbone
functional group - specific comination of bonded atoms that always has the same chemical properties and always reacts the same way
Functonal group
Specific combinatio of bonded and always reacts the same way
reactivity of organic molecule largely dependent on attached functional groups
often use R to stand for the rest of the molecule
The biological molecules of cells
4 categories
Carbohydrates, lipids, proteins, nucleic acids
Carbohydrates
Bread
corn
ice
pasta
potato
Lipid
Cheese
ice cream
lard
butter
oil
Protein
Milk
meat
tofu
nuts
beans
egg
Monomers
Subunits
Polymer
Monomers joined together