Amino Acids (AQA A-Level Chemistry): Flashcards

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Amino Acids
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Two functional groups in amino acids

Amine (−NH2-NH₂) and carboxylic acid (−COOH-COOH) groups

Name of central carbon in amino acid

α-carbon

Chirality of most amino acids

Chiral - exist as two mirror-image forms (enantiomers)

Which amino acid is not chiral?

Glycine (R group is hydrogen)

Definition of zwitterion

Dipolar ion with + and - charges but no net charge

Meaning of amphoteric

Can react with both acids and bases

Definition of isoelectric point (pI)

pH where amino acid exists as zwitterion (no net charge)

Form of amino acid at high pH

Anionic form

Form of amino acid at low pH

Cationic form

How many naturally occurring α-amino acids?

20

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