only question (b) (a) What is the role of solvent on nucleophilic substitution reactic(b) Amino acids are dipolar ions. Is it correct? Explain.(c) What happens when concentrated HNO3 is added into a solutiH2SO4 acid? Explain with chemical reaction.

Amino acids are organic molecules that contain one amino and one carboxylic acid group. However,…

Answered: Amino acids are dipolar ions. Is it…

Organic Chemistry

8th Edition

ISBN:9781305580350

Author:William H. Brown, Brent L. Iverson, Eric Anslyn, Christopher S. Foote

Publisher:William H. Brown, Brent L. Iverson, Eric Anslyn, Christopher S. Foote

Chapter27: Amino Acids And Proteins

Section: Chapter Questions

Problem 27.19P

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Similar questions

A 1.00-mg sample of a pure protein yielded on hydrolysis 0.0165 mg of leucine and 0.0248 mg of isoleucine. What is the minimum possible molar mass of the protein? (MMleucine=MMisoleucine=131g/mol)
Treatment of a new protein with dansyl chloride reveals two (2) dansyl-labelled derivatives of amino acids, alanine and methionine. What can you deduce about the structure of the proteinfrom these results?
Draw the structure of leu-enkephalin, a pentapeptide that acts as an analgesic and opiate, and has the following sequence: Tyr–Gly–Gly–Phe–Leu. (The structure of a related peptide, met-enkephalin, appeared in Section 22.6B.)
A. Lysine is considered a basic amino acid containing a guanidino group. If all ionizable protons from lysine were deprotonated, what will be the overall charge for the lysine? B. Which of the following is true regarding amino acids? -Leucine and isoleucine have the same molecular mass. -Glycine is a chiral molecule. -Proline is considered to be an ⍺-amino acid. -Lysine (short for L) is a basic amino acid.
Using alanine as an example, draw possible conformations of alanine in a peptide chain (Ala-Met-Thr) and identify which conformer is favoured.
The first amino acid incorporated into a polypeptide chain during its biosynthesis in prokaryotes is N-formylmethionine. Explain the purpose of the formyl group
The pKa of the amino and carboxyl groups on alanine are 9.9 and 2.4, respectively. Under physiological conditions (pH 7.4), what percentage of alanine is ionized?
Give the amino acid sequence of each peptide using the fragments obtained by partial hydrolysis of the peptide with acid. a. a tetrapeptide that contains Ala, Gly, His, and Tyr, which is hydrolyzed to the dipeptides His–Tyr, Gly–Ala, and Ala–His b. a pentapeptide that contains Glu, Gly, His, Lys, and Phe, which is hydrolyzed to His–Gly–Glu, Gly–Glu–Phe, and Lys–His
A tripeptides (made from one asparagine molecule, one cysteine molecule and one glutamic acid molecule) were synthesised. Hand-draw the skeletal structures of two possible tripeptides formed from these three amino acids, identifying the peptide bonds in each molecule.
Which amino acid has the greatest amount of negative charge at pH = 6.20?
(a) Redraw the tripeptide in zwitterionic form (b) Explain how ESI-MS can be used to determine which amino acid is in the middle of the sequence.
22-47 How many different tetrapeptides can be made (a) if the peptides contain the residues of asparagine, proline, serine, and metbionine and (b) if all 20 amino acids can be used?

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