sample of gelatin was treated with pepsin in the presence of HCI. After 15 min, the reaction wa with ninhydrin reagent and you observed a purple color. Explain the chemical reaction tha that lead to the color change_stating the substrate, enzyme and product of your reaction

sample of gelatin was treated with pepsin in the presence of HCI. After 15 min, the reaction wa with ninhydrin reagent and you observed a purple color. Explain the chemical reaction tha that lead to the color change_stating the substrate, enzyme and product of your reaction

Organic And Biological Chemistry

7th Edition

ISBN:9781305081079

Author:STOKER, H. Stephen (howard Stephen)

Publisher:STOKER, H. Stephen (howard Stephen)

Chapter10: Enzymes And Vitamins

Section: Chapter Questions

Problem 10.31EP

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Concept explainers

Vitamins and Coenzymes

A class of organic compounds needed in the human body for normal activities is known as vitamins. They are characterized into two parts depending upon their solubility in water. They can act as coenzymes, cofactors, or prosthetic groups for enzymes.

Question

Q14b A sample of gelatin was treated with pepsin in the presence of HCI. After 15 min, the reaction was
treated with ninhydrin reagent and you observed a purple color. Explain the chemical reaction that
occurs that lead to the color change stating the substrate, enzyme and product of your reaction.
2m

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Based on the graphical information in Problem 21-41 about enzymes A and B indicate whether the enzyme activity of enzyme B increases or decreases when the following changes in reaction conditions are made. a. pH decreases from 7.6 to 7.2 b. pH increases from 7.2 to 7.4 c. temperature decreases from 37.8C to 37.6C d. temperature increases from 38.2C to 38.4C
. Describe the lock-and-key model for enzymes. Why are the shapes of the enzyme and its substrate important in this model? What does it mean to say that an enzyme is inhibited by a particular molecule? What happens if this inhibition is irreversible? Can you think of a situation in which it might be advantageous to be able to inhibit an enzyme?
Compare the lock-and-key and induced-fit models for substrate binding to an enzyme.
Based on the graphical information in Problem 21-41 about enzymes A and B a. What is the optimum pH for enzyme B? b. What is the optimum temperature for enzyme A? c. Which enzyme has the greater activity at a pH of 7.2? d. Which enzyme has the greater activity at a temperature of 37.2C?