Chapter 3: Amino Acids
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20 Terms
Hydroxyl properties
polar
Methyl Properties
non-polar
Carbonyl properties
polar
Carboxyl properties
acidic (releases H)
Amino properties
basic (accepts H)
Phosphate properties
acidic (releases H)
Sulfhyryl properties
polar
Each amino acid has four things…
amino group, carboxyl group, hydrogen, side chain (R-group)
Amino acids exist in the ___ and ___ forms
L and D
In acidic conditions, free amino acids are
both groups protonated
In neutral conditions, free amino acids are
dipolar ions (zwitterions)
In basic conditions, free amino acids are
both groups deprotonated
Non-polar R groups means that…
the amino acid is hydrophobic
Neutral R groups mean that…
the amino acid is polar with an unevenly distributed charge
Positively charged R groups mean that…
the amino acid is positively charged
Negatively charged R groups mean that…
the amino acid is negatively charged
Amino acids with hydrocarbon side chains are
hydrophobic
Amino acids with electronegative side chains are
polar
Amino acids with a negative charge have
acidic side chains
Positively charged amino acids have
basic side chains
Note 
Flashcards (46)