The pH vs charge graph for a triprotic amino acid is shown below. Please answer the followingquestions about the amino acid.21.510.5-0.5-146.8101214pHa. Which of the following triprotic amino acids is this? [ Select ]b. What is the isoelectric point? (Please select the appropriate range in which the isoelectric pointfalls) (Hint - look up the pka values in the pKa table for amino acids, which was in video one oftoday's lecture) [ Select ]c. What form of this amino acid dominates at a pH of 8? Please select the correct form for eachionizable group.Alpha amino [ Select ]Alpha carboxyl [ Select ]R [ Select ]Net Charge

An amino acid with the ability to donate 3 protons (3 H+) is called a triprotic amino acid. The 3…

Answered: The pH vs charge graph for a triprotic…

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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Answer the following questions based on the structure of the following peptide and the information in the attached table of enzyme activities. M-F-V-W-E-Q-A-P-S-P-L The charge of this peptide at pH 7 would be
Consider a protein in which a negatively charged glutamic acid side chain (pKa=4.2) makes a salt bridge (ion-ion interaction) with a positively charged histidine side chain (pKa=6.5). Part C: Justify your answer with calculations of partial charges on these amino acid side chains at pH=7.9.(Hint: Consider lessons from Coulomb's law, and the Henderson-Hasselbalch equation.)
Pepsin is the name given to a mix of several digestive enzymes secreted (as larger precursor proteins) by glands that line the stomach. Theseglands also secrete hydrochloric acid, which dissolves the particulate matter in food, allowing pepsin to enzymatically cleave individual protein molecules. The resulting mixture of food, HCl, and digestive enzymes is known as chyme and has a pH near 1.5. What pI would you predict for the pepsin proteins? What functional groups must be present to confer this pI on pepsin? Which amino acids in the proteins would contribute such groups?
Determine the pKa of the amino acid using the graph graph attached:
In a TPN bag contains: Kcal of 1000 ml of D50 W, 1000 ml of 7% amino acids, and 650 ml of 20% lipids. A. How many total kcal is provided by this bag of TPN?
Calculate the isoelectric point for each amino acid.a. asparagine: pKa (COOH) = 2.02; pKa (α-NH3+) = 8.80b. methionine: pKa (COOH) = 2.28; pKa (α-NH3+) = 9.21
The structure of ephedrine isgiven, The pKa for ephedrine is 9.6. Answer the following questions about aqueous solutions of ephedrine. a. Draw the structure of the principal chemical form of ephedrine that results when it isdissolved in water.b. Draw the structure of the principal chemical form of ephedrine that results when it is dissolved in a buffer at a physiologically relevant pH of 7.4.c. Calculate the pH that results when 0.3 mole of ephedrine is dissolve in 2.0 L of 0.05 M perchloric acid (HClO4).
B) An aqueous solution (pH ~7) containing mixture of three amino acids; glycine (G), arginine (R) and glutamic acid (E), was dropped onto center of a solid matrix (e.g chromatographic paper) which is incorporated in an electrical circuit (a). After applying electrostatic potential, the aminoacids are separated as shown in b. Determine amino acids that are labeled as 1, 2 and 3. a) DC Power Supply (OFF) b) DC Power Supply (ON) Solid matrix Solid matrix Cathode Anode Cathode Anode buffer buffer buffer buffer Sample containing amino acids G, R, E
Given this: Protein Isoelectric pH Molecular weight (kDa) Ovalbumin 4.6 45 Insulin 5.4 5.7 Fibrinogen 5.8 340 Y-globulin 6.6 160 Collagen 6.6 115 Hemoglobin (monomer) 7.1 16 Myoglobin 7.0 16.7 Does all proteins separated properly w/ isoelectric focusing?
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)
1.0.1 mL of a protein solution of concentration of 11 mg/mL was diluted to a total volume of 4.0 mL with water (i.e. 0.1 mL of the solution was added to 3.9 mL of water). 2 mL of this solution was then mixed with 18 mL of water. What is the concentration of the diluted protein solution? Space to show your workings:
Match the structures (i-iv) to the correct molecules from the dropdown list provided. Not all molecules on the list will be used. The list: cholesterol, amino acid, phospholipid, deoxyribose, triglyceride, fatty acid, a steroid hormone i. OH iii. ii. iv. You may also click here to see the image. Molecule in panel (i) is cholesterol Molecule in panel (ii) is [ Select ] Molecule in panel (iii) is phospholipid [ Select ] Molecule in panel (iv) is

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