Living organisms on Earth are made of primarily water and molecules containing carbon.
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Transcript of Living organisms on Earth are made of primarily water and molecules containing carbon.
What’s so snazzy about carbon?
A Horta is a hypothetical silicon-based life form instead of a carbon-based life
Carbon has 4 valence electrons:
H H C C
H
H
Hydrocarbons = molecules of carbon and hydrogen
Carbon-hydrogen covalent bonds (C-H bonds) are nonpolar, and contain large amounts of energy
Table 4.1 Functional Groups of Organic Compounds
Functional Groups = Specific groups of atoms that make up part of a larger molecule and have particular chemical properties (shape, polarity, reactivity, solubility)
Biological Macromolecules• Most of the large organic molecules that living organisms
are built from are made of smaller molecules joined together
• Polymers = molecules built by linking together a large number of small chemical subunits. The single subunits are called monomers. The monomers may be all identical or vary.
Cellulose:
Four Major Types of Biological Macromolecules
Type of PolymerMonomers making up Polymer
Example
Carbohydrates (Polysaccharides)
MonosaccharidesSugars, Starch, Cellulose
LipidsFatty acids and glycerol
Fats, steroids, cholesterol
Proteins Amino acidsEnzymes, structural components
Nucleic Acids Nucleotides DNA, RNA