Introduction to General, Organic and Biochemistry
11th Edition
ISBN: 9781285869759
Author: Frederick A. Bettelheim, William H. Brown, Mary K. Campbell, Shawn O. Farrell, Omar Torres
Publisher: Cengage Learning
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Textbook Question
Chapter 23, Problem 23.71P
1 Food can be preserved by inactivation of enzymes that would cause spoilage—for example, by refrigeration. Give an example of food preservation in which the enzymes are inactivated (a) by heat and (b) by lowering the pH.
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Enzymes function most efficiently at the temperature of a typical cell, which is 37 degrees Celsius. Increases or decreases in temperature can significantly lower the reaction rate. What does this suggest about the importance of temperature-regulating mechanisms in organisms? How does this translate to the development of enzyme assays for clinical laboratory testing equipment? Explain.
Which of the following is NOT true regarding biomolecular reactions
a. K association is the inverse of k dissociation
b. Reate of reaction is dependent of rate of collision
c. Irreversible reactions cannot reach equilibrium
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Meat is refrigerated to prevent spoilage by bacteria because the cold
denatures bacterial enzymes
inactivates, but does not denature, bacterial enzymes
decreases the turnover number of bacterial enzymes
makes meat proteins more resistant to bacterial enzyme activity
Chapter 23 Solutions
Introduction to General, Organic and Biochemistry
Ch. 23 - What is the difference between a catalyst and an...Ch. 23 - What are ribozymes made of?Ch. 23 - Would a lipase hydrolyze two triglycerides, one...Ch. 23 - Compare the activation energy in uncatalyzed...Ch. 23 - Prob. 23.5PCh. 23 - Prob. 23.6PCh. 23 - Prob. 23.7PCh. 23 - Monoamine oxidases are important enzymes in brain...Ch. 23 - Prob. 23.9PCh. 23 - 0 What kind of reaction does each of the following...
Ch. 23 - Prob. 23.11PCh. 23 - Prob. 23.12PCh. 23 - 3 What is the difference between reversible and...Ch. 23 - Prob. 23.14PCh. 23 - 5 At a very low concentration of a certain...Ch. 23 - 6 If we wish to double the rate of an...Ch. 23 - 7 A bacterial enzyme has the following...Ch. 23 - 8 The optimal temperature for the action of...Ch. 23 - 9 The activity of pepsin was measured at various...Ch. 23 - Prob. 23.20PCh. 23 - Prob. 23.21PCh. 23 - Prob. 23.22PCh. 23 - Prob. 23.23PCh. 23 - 4 What kind of chemical reaction occurs most...Ch. 23 - 5 Which of the following is a correct statement...Ch. 23 - Prob. 23.26PCh. 23 - 7 Enzymes are long protein chains, usually...Ch. 23 - Prob. 23.28PCh. 23 - Prob. 23.29PCh. 23 - 0 Can the product of a reaction that is part of a...Ch. 23 - 1 What is the difference between a zymogen and a...Ch. 23 - 2 The enzyme trypsin is synthesized by the body in...Ch. 23 - Prob. 23.33PCh. 23 - Prob. 23.34PCh. 23 - Prob. 23.35PCh. 23 - Prob. 23.36PCh. 23 - Prob. 23.37PCh. 23 - Prob. 23.38PCh. 23 - 9 The enzyme phosphofructokinase (PFK) (Chapter...Ch. 23 - Prob. 23.40PCh. 23 - 1 After a heart attack, the levels of certain...Ch. 23 - Prob. 23.42PCh. 23 - Prob. 23.43PCh. 23 - Prob. 23.44PCh. 23 - 5 Chemists who have been exposed for years to or...Ch. 23 - 6 Which enzyme preparation is given to patients...Ch. 23 - 7 Chymotrypsm is secreted by the pancreas and...Ch. 23 - 8 Explain why transition-state analogs are potent...Ch. 23 - Prob. 23.49PCh. 23 - 0 Explain the relationship between...Ch. 23 - 1 (Chemical Connections 23A) Acetylcholine causes...Ch. 23 - Prob. 23.52PCh. 23 - Prob. 23.53PCh. 23 - Prob. 23.54PCh. 23 - Prob. 23.55PCh. 23 - 6 (Chemical Connections 23C) What role does Mn2+...Ch. 23 - 7 (Chemical Connections 23C) Which amino acids of...Ch. 23 - 8 (Chemical Connections 23D) What is the strategy...Ch. 23 - 9 (Chemical Connections 23D) Why did scientists...Ch. 23 - Prob. 23.60PCh. 23 - Prob. 23.61PCh. 23 - Prob. 23.62PCh. 23 - 3 (Chemical Connections 23E) What is the...Ch. 23 - Prob. 23.64PCh. 23 - Prob. 23.65PCh. 23 - Prob. 23.66PCh. 23 - Prob. 23.67PCh. 23 - Prob. 23.68PCh. 23 - Prob. 23.69PCh. 23 - Prob. 23.70PCh. 23 - 1 Food can be preserved by inactivation of enzymes...Ch. 23 - Prob. 23.72PCh. 23 - 3 Would you expect to find active digestive...Ch. 23 - Prob. 23.74PCh. 23 - Prob. 23.75PCh. 23 - Prob. 23.76PCh. 23 - 7 An enzyme has the following pH dependence: At...Ch. 23 - Prob. 23.78PCh. 23 - Prob. 23.79PCh. 23 - 0 Nerve gases operate by forming covalent bonds at...Ch. 23 - 1 What would be the appropriate name for an enzyme...Ch. 23 - Prob. 23.82PCh. 23 - 3 A liver enzyme is made of four subunits: 2A and...Ch. 23 - Prob. 23.84PCh. 23 - Prob. 23.85PCh. 23 - Prob. 23.86PCh. 23 - Prob. 23.87PCh. 23 - Prob. 23.88PCh. 23 - Prob. 23.89PCh. 23 - Prob. 23.90PCh. 23 - Prob. 23.91P
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- Write the chemical equilibrium and expression for the equilibrium constants for the ionization of (a) tartaric acid. (b) malic acid.arrow_forwardThe site on an enzyme molecule that does the catalytic work is called the: a. binding site. b. allosteric site. c. lock. d. active site.arrow_forwardDescribe the difference between graphs showing temperature versus reaction rate for an enzyme-catalyzed reaction and an uncatalyzed reaction.arrow_forward
- Once cooked, egg whites remain in a solid form. However, egg whites that are beaten to form meringue will partially change back to a jellylike form if allowed to stand for a while. Explain these behaviors using the concept of reversible protein denaturation.arrow_forwardSubstrate Enzyme-substrate complex 1. Is this an example of a lock & key or induced fit model of an enzyme? > Enzymearrow_forwardWhich of the following describes the effect of temperature on enzyme activity? Enzymes are most active at high temperatures. Protein structures in enzymes are most active at temperature above 37° C. Enzyme activity linearly decreases with temperature. Protein structures in enzymes are most effective at low temperatures. The protein structure of an enzyme is altered at temperature values above the optimum value. Enzyme is most active at the optimum temperature value. The protein structure of an enzyme is effective at temperature values below and above the optimum value. Enzyme is least active at the optimum temperature.arrow_forward
- The enzyme urease catalyzes the breakdown of urea in the body. Urease breaks urea down to 2NH3 + CO2. This is an example of a hydrolysis reaction (urea plus water For each equivalent of carbon dioxide (CO2), two equivalents of ammonia (NH3) are produced. Label the enzyme, substrate, enzyme-substrate complex, enzyme-product complex, and product in the enzymatic reaction for the breakdown of urea by urease using the induced-fit model. Drag the appropriate labels to their respective targets. ► View Available Hint(s) Urease – 2NH3 + CO2 Urea - 2NH3 + CO2 Urease - Urea 2NH3 + CO2 Urease Urea cj Complex Pearson 1. + Complex Reset Helparrow_forward1. Describe enthalpy with respect to free energy change. 2. Describe the term endergonic with respect to a system's free energy change. 3. Distinguish between free energy of a reaction and activation energy for that same reaction. 4. What is an enzyme mechanism?arrow_forward
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