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AQA A-Level Chemistry Amino Acids, Proteins + DNA £4.99
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AQA A-Level Chemistry Amino Acids, Proteins + DNA
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A complete set of notes for the Amino Acids, Proteins and DNA topic for AQA A-Level Chemistry. These notes are all tailored to the specification and is a complete resource.

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  • June 28, 2022
  • 8
  • 2021/2022
  • Other
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Amino Acids,
Proteins, and
DNA

, ZWITTERIONS:
Amino Acids Ions that have both a permanent
negative charge, though the compo
- Have 2 functional groups (an amine overall.
and a carboxylic acid) The carboxylic acid group has a ten
- 20 important naturally occurring a proton (produce the negative ch
amino acids and all exist as a-amino amine group has the tendency t
acids proton (produce the positive
- Chiral molecule The ionic interaction between z
- Almost all naturally occurring amino explains the relatively high meltin
acids exist as the - enantiomer amino acids as opposed to the wea
bonding that would occur in the no

Acid:
In strongly acidic conditions, the lone pair of the H2-N
group accepts a proton to form a positive ion
The amino group has gained a hydrogen ion – it is
protonated.

Alkali:
In strongly alkali conditions, the –OH group loses a
proton to form the negative ion.
The carboxylic acid group has lost a hydrogen ion – it is Isoelectric Point – the pH at which a molecule
deprotonated. net electrical charge or is electrically neutral.

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