Living organisms on Earth are made of primarily water and molecules containing carbon.

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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.

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

What do carbon and silicon have in common?

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

Organic Molecules contain at least one C-C bond

Isomer = molecules with the same number and type of atoms, but different arrangements

Figure 4.7 The pharmacological importance of enantiomers

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:

Monomers are joined together by a condensation/dehydration reaction

Requires energy

Polymers are taken apart by a hydrolysis reaction

Releases energy

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