In this problem consider how Glycine's charge changes with pH. You can find the pKas for the alpha-carboxylic and alpha-amino groups above. Determine the net charge at the following pH values. Theanswer options are rounded to the nearest 0.5 unit; please match each pH to the best choice.pH = 1pH = 2.35pH = 6pH = 9.78pH = 13+10-1.0-2.0-2.0

Glycine is the smallest of the twenty amino acids found in proteins. It has a simple structure with…

Answered: In this problem consider how Glycine's…

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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0.03 The uv spectrum of a protein solution shows A280 nm = 0.43 and A260 nm = What is the approximate protein concentration in mg/mL?
What average positive charge of an amino acid side chain with pKa 10.9 at a pH value of 11.9? Answer up to two decimals. (Please type answer no write by hend)
Calculate the Rf values for each of the amino acids and enter your data in the table.Based on your calculations, what is the identity of the Unknown amino acid? Rank the amino acids from most hydrophilic to most hydrophobic
TE buffer consists of 10 mM of Tris-Cl, pH 7.6 and 1mM of EDTA, pH 8.0. You need to prepare 3L of TE buffer and you have the following stock solutions: 500 mM Tris-Cl and 1 M EDTA. How will you prepare the 3L of TE? Write work clearly
What is the pH of a grapefruit that contains 0.007 M citric acid solution (CHgO7)? C6H307(aq) + H₂O(E)= CsH707 (aq) + H₂O*(aq) K₂=7.5 x 104 Round your answer to 2 decimal places.
You have been observing an insect that defends itself from enemies by secreting a caustic liquid. Analysis of the liquid shows it to have a total concentration of formate plus formic acid (K₁ = 1.8 x 10-4) of 1.45 M. Further analysis reveals that the concentration of formate ion is 0.015 M. What is the pH of the secretion? pH =
Cellular pH is slightly alkaline (pH 7.4); Explain why a seemingly slight decrease in pH to 6.8 can have very serious consequences for the body, becoming fatal?
Calculate the unknown concentration of the PROTEIN C with an absorbance value of A412 given the standard curve indicated in the table below. Write your final answer (NUMBER ONLY) in two decimal places rounded off. Protein concentration (µg/mL) 0 0.02 0.04 0.06 0.08 0.10 Your answer APIENT Absorbance 0.000 0.161 0.284 0.438 0.572 0.762
An import relationship that allows us to determine the pKa of a weak acid using a pH titration curve is: pH = pKa (at the half-equivalence point) Explain which chemical species are present at this point in a WA/SB titration that makes this relationship true.
Make use of the table below in answering the questions asked: Amino acid pK₁ pK₂ pK, Isoleucine 2.32 9.76 Leucine 2.32 9.74 Lysine 2.16 9.06 10.54 Tyrosine 2.20 9.21 10.46 I 1. Make sure to answer in two decimal places. What is the pl of the tripeptide ILY? 2. At pH 9.00, at which electrode will the ILY tripeptide be moving to? A. Anode B. Cathode C. The tripeptide will not move to either electrodes Make sure to show a solution or explanation for the answer.
Glutamic acid (1one of the 20 amino acids) has a side- chain carboxyl group (COOH, pKa = 4.3) as shown in Figures 4.7 and 4.8 a. Write the chemical equation for the dissociation of the side chain COOH. Label the weak acid and the conjugate base. b. The Henderson-Hasselbalch Equation (shown below) can be used to determine the ionization status of a weak acid: pH = pKa + log [base] Use the Henderson Hasselbalch equation to determine whether the glutamic acid side chain [acid] • carboxyl group is protonated or deprotonated at physiological pH.
N-(2-hydroxyethyl)piperazine-N'-(2-ethanesulfonic acid) buffer at pH 7 with 400 mM NaCl. A A purified protein is in a Hepes dialysis membrane tube holds a 5.0 mL sample of the protein solution. The sample tube floats in a beaker containing 0.50 L of the same Hepes buffer, but with 0 mM NaCl, for dialysis. Small molecules and ions (such as Na*, CI", and Hepes) can to diffuse across the dialysis membrane, but the protein cannot. Assume there are no sample volume changes during the dialysis. Calculate the final concentration of NaCl in the protein sample once the dialysis has come to equilibrium. Calculate the final NaCl concentration in the 5.0 mL protein sample after dialysis in 300 mL of the same Hepes buffer, with 0 mM NaCl, twice in succession. [NaCl] after a single dialysis: [NaCl] after a double dialysis: mM mM

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