1. Since the pK values for aspartic acid are 2.0, 3.9 and 10.0, it follows that the isoelectric (pH) is(A) 3.0 (B) 3.9 (C) 5.9 (D) 6.0

Amino acids are the main units of protein. Each amino acid has a central carbon atom called Cα. To…

Answered: 1. Since the pK values for aspartic…

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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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 osmotic pressure of human blood is 7.6 atm at 37 °C. What mass of glucose, C6H12O6, is required to make 1.00 L of aqueous solution for intravenous feeding if the solution must have the same osmotic pressure as blood at body temperature, 37 °C?
explain step by step why the correct answer is C
Φ and ψ in the Ramachandran plot (below) are: a) Rotational angles around the bond between the α-carbon and N-H (Φ) and C=O (ψ). b) Amino acid solubility in octanol (Φ) and water (ψ). c) Hydrogen bond angles in α-helices (Φ) and β-sheets (ψ). d) Amino acid solubility in water (Φ) and octanol (ψ).
Buffers are aqueous solutions that tend to resist changes in pH when small amounts of strong acid (H+) or base (OH-) are added. Compare the changes in the pH of the resulting solution when you add 0.1 M NaOH in (a) distilled water and (b) bicarbonate solution. A) (a) and (b) solutions will have the same pH. B) pH change in (b) will be higher than in (a). C) No changes in pH of both solutions. D) pH change in (a) will be higher than in (b).
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.
1)Ubiquitin is a small protein with a monoisotopic mass of 8560 Da. a) Electrospray ionization of this small protein typically results in major charge states of +8, +9, +10, +11, +12, and +13. Using this information, complete the table below, assuming the charges on each come from protonation. Report mass and m/z values to the ones place. b) Using the data you entered in the table, sketch an expected ESI-MS spectrum for ubiquitin. Label each peak with its charge state. What do you notice about the spacing of peaks along the x-axis. c)The figure shows an experimentally obtained electrospray mass spectrum for ubiquitin. Compare this spectrum to the spectrum you predicted. Are there any differences? If so, what might cause these differences?
Given the titration curve of the hypothetical polyprotic acid X at 0.100 M concentration (pKa1=4.0, pKa2=8.0, pKa3=12.0) titrated with 0.600 M NaOH, identify the pH at point C, H, E, and M.
32) You are working with an molecule with a pl of 6.00 and the pKa's of the ionizable groups on the molecule are 1.3, 4.1 and 7.9. You would like this amino acid to have a net negative charge. Which of the following pH values would result in a net negative charge? A) 1.3 B) 4.1 C) 4.43 D) 6.0 E) 7.9
(Biochemistry) Discuss the factors that affect the 260/280 ratio.
1. Each "20-mg" capsule of Prozac contains 22.5 mg of fluoxetine HCL (m.w. 345.63) equivalent to 20 mg of fluoxetine base. Calculate the molecular weight of the fluoxetine base. Round your answer to the HUNDRETHS decimal place. 2. Each "100-mg" tablet of Imitrex contains 140 mg of sumatriptan succinate equivalent to 100 mg sumatriptan base. If the molecular weight of sumatriptan succinate is 413.5, calculate the molecular weight of sumatriptan base. Round your answer to the HUNDRETHS decimal place.
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.

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1. Since the pK values for aspartic acid are 2.0, 3.9 and 10.0, it follows that the isoelectric (pH) is (A) 3.0 (B) 3.9 (C) 5.9 (D) 6.0