2. What observation recorded in Table 30.3 indicated that butterfat in the milk

Question

2. What observation recorded in Table 30.3 indicated that butterfat in the milk had been hydrolyzed? a.Milk color changed nom pink to blue. b Milk color changed from blue to pink. c. Milk color remained unchanged. Explain your answer 3. Which of the following observations from Part C of the experiment indicates this greatest activity fur the proteolytic enzyme such as pepsin or trypsin? a. Complete gelation occurs rapidly. b. Only partial gelation occurs during an hour. c. No gelation occurs during an hour. Explain your answer 4. Suppose in Part E, Step 2, a student gets a red solution when 1 drop of phenol red indicator is added to the tube. Which of the following would explain this result a. The test tube was dirty and contained a little hydrochloric acid. b. The test tube was dirty and contained a little sodium hydroxide. c. The test tube was dirty and contained a little urea. Explain your answer. A student did Part F of the experiment and noticed the evolution of a gat when the hydrogen peroxide was added. What was the gas? a. Water vapor given off when the reaction mixture got hot. b. Oxygen produced by the reaction. c. Hydrogen produced by the reaction. d. More than one answer is correct. Explain your answer.

Explanation / Answer

3 is C. No gelation occurs during an hour...If gelation occurs in the presence of a proteolytic enzyme, it means that the enzyme is not active. If gelation does not occur, it means the enzyme is active and is hydrolyzing the gelatin under those conditions. (taken right out of the book....)

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