How to draw titration of amino acids ？what happen when ph increase from low to high？1. what does it means when pka and ph are equal？2. Did I calculate p1 correctly？？3. Does cysteine lose H in SH ？should it be positively charged or negatively charged after lose H and why？？ Histidine.аонH₂N²-C - HCH₂|| M\N//+ HCoCoo+1H ~ H³N² C-H = H₂N-C-H ~ H₂N-C-HPK9=PH=1.82 CH² Pha=PH=6.0 CH² PRAZPH=9.17 07/1₂enIMHM\N/+H(1+)(2+)cysteinecosаон1NH÷-C-H ~ M÷-C-HGCH21SH(+1)P₁ =CH2हम(0)Pra-PH=1-711P₁ =\N/+H(0)6.0+ 9.7221.71+8.33كيفCH₂SH(-1)= 15.172N/(-1)=NH₂=C-H = H₂C-HCH₂Pha-PH=8.331 Pha=PH= 10.787.585,Seernt

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Biochemistry

9th Edition

ISBN:9781319114671

Author:Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.

Publisher:Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.

Chapter1: Biochemistry: An Evolving Science

Section: Chapter Questions

Problem 1P

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How to draw titration of amino acids ？what happen when ph increase from low to high？ 1. what does it means when pka and ph are equal？ 2. Did I calculate p1 correctly？？ 3. Does cysteine lose H in SH ？should it be positively charged or negatively charged after lose H and why？？

Histidine.
аон
H₂N²-C - H
CH₂
|| M
\N//
+ H
Co
Coo
+1
H ~ H³N² C-H = H₂N-C-H ~ H₂N-C-H
PK9=PH=1.82 CH² Pha=PH=6.0 CH² PRAZPH=9.17 07/1₂
en
IMH
M
\N/
+H
(1+)
(2+)
cysteine
cos
аон
1
NH÷-C-H ~ M÷-C-H
GCH2
1
SH
(+1)
P₁ =
CH2
हम
(0)
Pra-PH=1-711
P₁ =
\N/
+H
(0)
6.0+ 9.7
2
2
1.71+8.33
كيف
CH₂
SH
(-1)
= 15.17
2
N/
(-1)
=NH₂=C-H = H₂C-H
CH₂
Pha-PH=8.331 Pha=PH= 10.78
7.585,
S
e
er
n
t

Expert Solution

Amino acids can act like an weak acid or base

Amino acids are biomolecules that have an amino group and a carboxyl group linked to the same carbon called alpha carbon. Other than the amino and carboxyl groups, amino acids have a side chain linked to the alpha carbon. Amino acids differ from each other in the side group that is linked to the alpha carbon.

The alpha-amino group and alpha-carboxyl groups are ionisable, the side group is ionisable in only some amino acids. When amino acids are dissolved in water, they can act either like an acid or like a base. This is why they are called dipolar ions or zwitterion.