proteins 3
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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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