Please correct answer and don't use hend raiting Aspartic acid has a side chain bearing a carboxylic acid group; its pKa is 4. The a-amino anda-carboxylic groups have pKa values similar to those of alanine. Determine the net chargeon an aspartic acid molecule at the following pH values:(for additional ungraded practice, see if you can identify which of the curves from theprevious question correspond to Aspartic acid)pH = 1pH = 2.5pH = 4+2+10pH = 9-1pH = 13-2

To determine the net charge on an aspartic acid molecule at different pH values, we need to consider…

Answered: Aspartic acid has a side chain bearing…

General, Organic, and Biological Chemistry

7th Edition

ISBN:9781285853918

Author:H. Stephen Stoker

Publisher:H. Stephen Stoker

Chapter20: Proteins

Section: Chapter Questions

Problem 20.75EP

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22-49 Based on your knowledge of the chemical properties of amino acid side chains, suggest a substitution for leucine in the primary structure of a protein that would probably not change the character of the protein very much.
22-20 Show how alanine, in solution at its isoelectric point, acts as a buffer (write equations to show why the pH does not change much if we add an acid or a base).
22-62 Distinguish between intermolecular and intramolecular hydrogen bonding between backbone groups. Where in protein structures do you find one, and where do you find the other?
What special role does the amino acid cysteine have in the peptides vasopressin and oxytocin?
22-21 Explain why an amino acid cannot exist in an un-ionized form at any pH.
22-89 What kind of noncovalent interaction occurs between the following amino acids? (a) Valine and isoleucine (b) Glutamic acid and lysine (c) Tyrosine and threonine (d) Alanine and alanine
22-53 Do iron and zinc ions play role in protein structure? If so, what is the role for either or both?
22-59 What is the effect of salt bridges on the tertiary structure of proteins?
22-85 Denaturation is usually associated with transitions from helical structures to random coils. If an imaginary process were to transform the keratin in your hair from an (-helix to a (-pleated sheet structure, would you call the process denaturation? Explain.
22-42 (a) How many atoms of the peptide bond lie in the same plane? (b) Which atoms are they?
22-91 Which amino acid does not rotate the plane of polarized light?
22-31 A polypeptide chain is made of alternating valine and phenylalanine. Which part of the polypeptide is polar (hydrophilic)?

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