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Characteristics of

Proteins Contain carbon, hydrogen, oxygen,

nitrogen, and sulfur

Serve as structural components ofanimals

Serve as control molecules (enzymes)

Serve as transport and messengermolecules

Basic building block is the amino acid

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mino cid

mine group acts like a base, tends to be

positive!Carboxyl group acts like an acid, tends to benegative!"#$ group is variable, from % atom to &'!o amino acids *oin together to form a

dipeptide!

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Some mino cids

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Some +ore minocids

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Still +ore minocids

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ormation of a -ipeptide

-ehydration synthesis

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mino cid . mino cid //0 -ipeptide

mino cid . -ipeptide //0 ripeptide

!! . !! . 1!!. ripeptide //02olypeptide

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protein consists of one or morepolypeptide chains!

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