Q4. At a pH equal to the isoelectric point of alanine, the net charge on alanine is zero. Two structures can be drawn that have a net charge of zero, but the predominant form of alanine at its pl is zwitterionic. CH3 H₂N-C- 0 0 H Zwitterionic CH3 H₂N-C-C Η Uncharged 0 OH What fraction of alanine is in the completely uncharged form at its pl? Justify your assumptions.

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Q4. At a pH equal to the isoelectric point of alanine, the net charge on alanine is zero. Two
structures can be drawn that have a net charge of zero, but the predominant form of alanine
at its pl is zwitterionic.
CH3
00
=
0
H₂N-C-C
H
Zwitterionic
CH3
H₂N-C-C
H
Uncharged
O
=
OH
What fraction of alanine is in the completely uncharged form at its pl? Justify your
assumptions.
Transcribed Image Text:Q4. At a pH equal to the isoelectric point of alanine, the net charge on alanine is zero. Two structures can be drawn that have a net charge of zero, but the predominant form of alanine at its pl is zwitterionic. CH3 00 = 0 H₂N-C-C H Zwitterionic CH3 H₂N-C-C H Uncharged O = OH What fraction of alanine is in the completely uncharged form at its pl? Justify your assumptions.
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