Concept explainers
Answers to all problems are at the end of this book. Detailed solutions are available in the Student Solutions Manual, Study Guide, and Problems Book.
Quantitative Relationships Between Rate Constants to Calculate Km, Kinetic Efficiency (kcat/Km) and Vmax - IV Carbonic anhydrase catalyzes the hydration of
a. What is Vmax for this enzyme?
b. Assuming 5 pmol/mL (
c. What is the catalytic efficiency of this enzyme?
d. Does carbonic anhydrase approach "catalytic perfection"?
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Biochemistry
- Answers to all problems are at the end of this book. Detailed solutions are available in the Student Solutions Manual, Study Guide, and Problems Book. Plot the Titration Curve for Bicine and Calculate How to Prepare a pH 7.5 Bicine Buffer Solution Bicine (N, N—bis (2-hydroxyethyl) glycine) is another commonly used buffer in biochemistry labs. The structure of Bicine in its fully protonated form is shown here: Draw the titration curve for Bicine. assuming the pA'a for its free COOH group is 2.3 and the pAa for its tertiary amino group is 8.3. Draw the structure of the fully deprotonated form (completely dissociated form) of bicine. You have available a U.l Msolution of Bicine at its isoelectric point (pH|)T 0.1 M solutions of HCI and NaOH. and ample distilled water. Describe the preparation of 1 L of 0.U4 M Bicine buffer. pH 7.5. What is the concentration of the fully protonated form of Bicine in your final buffer solution?arrow_forwardAnswers to all problems are at the end of this book. Detailed solutions are available in the Student Solutions Manual, Study Guide, and Problems Book. Calculate the pH in a Muscle Cell from the HPO42-/H2PO4Ratio If the internal pH of a muscle cell is 6.8, what is the [HPO42-]/ [H2PO4-] ratio in this cell?arrow_forwardAnswers to all problems are at the end of this book. Detailed solutions are available in the Student Solutions Manual, Study Guide, and Problems Book. Prepare a Buffer by Combining a Solution of Weak Acid with a Solution of the Salt of the Weak Acid Given 0.1 M solutions of acetic acid and sodium acetate, describe the preparation of 1 L of 0.1 M acetate buffer at a pH of 5.4.arrow_forward
- Answers to all problems are at the end of this book. Detailed solutions are available in the Student Solutions Manual, Study Guide, and Problems Book. Preparing a Phosphate Buffer Solution of pH 7.5 from Solutions of Na3PO4 and H3PO4 Given 0.1 M solutions of Na3PO4, and H3PO4 describe the preparation of 1 L of a phosphate buffer at a pH of 7.5. What are the molar concentrations of the ions in the final buffer solution, including Na+ and H+?arrow_forwardAnswers to all problems are at the end of this book. Detailed solutions are available in the Student Solutions Manual, Study Guide, and Problems Book. How to Prepare a Buffer Solution: An Anserine Buffer Draw the titration curve for anserine (Figure 2.16). The isoelectric point of anserine is the pH where the net charge on the molecule is zero: what is the isoelectric point for anserine? Given a 0.1 M solution of anserine at its isoelectric point and ready access to 0.1 M HCl, 0.1 M NaOH, and distilled water, describe the preparation of 1 L of 0.04 M anserine buffer solution. pH 7.2.arrow_forwardAnswers to all problems are at the end of this book. Detailed solutions are available in the Student Solutions Manual, Study Guide, and Problems Book. Quantitative Relationships Between Rate Constants to Calculate Km, Kinetic Efficiency (kcat/Km) and Vmax - VI The enzyme catalase catalyzes the decomposition of hydrogen peroxide: 2H2O22H2O+O2The turnover number (kcat) for catalase is 40,000,000 sec-1. The Km of catalase for its substrate H2O2 is 0.11 M. a. In an experiment using 3 nanomole/L of catalase, what is Vmax? b. What is v when [H2O2] = 0.75 M? c. What is the catalytic efficiency of catalase? d. Does catalase approach catalytic perfection?arrow_forward
- Answers to all problems are at the end of this book. Detailed solutions are available in the Student Solutions Manual, Study Guide, and Problems Book. Calculating [H] and pKd from the pH of a Solution of Weak Acid The pH of a 0.02 M solution of an acid was measured at 4.6. What is the [H+] in this solution? Calculate the acid dissociation constant Ka and pKa for this acid.arrow_forwardAnswers to all problems are at the end of this book. Detailed solutions are available in the Student Solutions Manual, Study Guide, and Problems Book. How to Prepare a Buffer Solution: a HEPES Buffer Given a solution of0.1 M HEPES in its fully protonated form and ready access to 0.l M HCl, 0.1 M NaOH, and distilled water, describe the preparation of 1 L of 0.025 M HEPES buffer solution, pH 7.8.arrow_forwardAnswers to all problems are at the end of this book. Detailed solutions are available in the Student Solutions Manual, Study Guide, and Problems Book. Polyprotic Acids: Citric Acid Species at Various pHs Citric acid, a tricarboxylic acid important in intermediary metabolism, can be symbolized as H3A. Its dissociation reactions are H3AH++H2ApK1=3.13H2AH++HA2pK2=4.76HA2H++A3pK3=6.40 If the total concentration of the acid and its anion forms is 0.02 M. what are the individual concentrations of H3A, H2A-, HA2-, and A3- at pH 5-2?arrow_forward
- Answers to all problems are at the end of this book. Detailed solutions are available in the Student Solutions Manual, Study Guide, and Problems Book. The enzyme alcohol dehydrogenase catalyzes the oxidation of ethyl alcohol by NAD+ to give acetaldehyde plus NADH and a proton: CHjCH3OH + NAD+ > C’H3CHO + NADH + H+ The rate of this reaction can be measured by following the change in pH. The reaction is run in 1-mL 10 m TRIS buffer at pH 8.6. If the pH of the reaction solution falls to 8.4 after 10 minutes, what is the rate of alcohol oxidation, expressed as nanomoles of ethanol oxidized per mL per sec of reaction mixture?arrow_forwardAnswers to all problems are at the end of this book. Detailed solutions are available in the Student Solutions Manual, Study Guide, and Problems Book. Calculating the pH of a Solution of a Weak Acid; Calculating the pH of the Solution after the Addition of Strong Base The ka for formic acid is 1.78 10-4 M. What is the pH of a 0.1 M solution of formic acid? 150 mL of 0.1 M NaOH is added to 200 mL of 0.1 M formic acid, and water is added to give a final volume of 1 L. What is the pH of the final solution?arrow_forwardAnswers to all problems are at the end of this book. Detailed solutions are available in the Student Solutions Manual, Study Guide, and Problems Book. Polyprotic Adds: Phosphate Species Abundance at Different pHs Whatare the approximate fractional concentrations of the following phosphate species at pH values of 0,2, 4, 6, 8, 10, and 12? H3PO4 24- HPO42- PO43-arrow_forward
- BiochemistryBiochemistryISBN:9781305577206Author:Reginald H. Garrett, Charles M. GrishamPublisher:Cengage Learning