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Home Q & A Board Biology-Related Homework Help Biochemistry
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Hog95 Hog95
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11 years ago
Calculate the pH at which a solution of cysteine would have no net charge.
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#1
Staff Member
11 years ago
Answer attached.
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how_mendel,  bio_man,  cherryballet,  majobe,  amm8487,  lynette,  Robyn,  hufflepuff,  Lesuhlo,  MISS.DMT,  sashie_m
- Master of Science in Biology
- Bachelor of Science
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#2
11 years ago
Calculate by averaging the pKa of the alfa carboxylic acid group of cysteine (2.05) and the pKa of the alfa ammonuim group (10.25). pI = 6.15 . Therefore, when pH= 6.15 cysteine has no net charge
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#3
11 years ago
average pI of the carboxyl(pk=1,8) & the side chain (pk=8,3)
pI=1,8+8,3/2=5,1
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Hog95 AuthorHog95
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#4
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11 years ago
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#5
Staff Member
11 years ago
Marking as solved!
- Master of Science in Biology
- Bachelor of Science
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#6
11 years ago
Man I was struggling with this! Thanks so much guys for this helpful site!
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#7
11 years ago
How do i write the structure of the tripeptide bond Met-Phe-Gln?
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#8
11 years ago
Thank you very much for the answer.... Its really helpful
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#9
Staff Member
11 years ago
Quote from: tshepiso (11 years ago)
Thank you very much for the answer.... Its really helpful

What did you end up writing for it though?
- Master of Science in Biology
- Bachelor of Science
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#10
10 years ago
Thanks for asking this question, definitely helped me out in my biochem class!   Slight Smile
Hog95 Author
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#11
9 years ago
My pleasure, and good luck with the rest Slight Smile
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#12
9 years ago
Thank you
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#13
9 years ago
thanks!
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