NESTER'S MICROBIOLOGY: A HUMAN PERSPECT
9th Edition
ISBN: 9781260161373
Author: Anderson, SALM
Publisher: MCGRAW-HILL HIGHER EDUCATION
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Chapter 30, Problem 5MC
Summary Introduction
Introduction:
The fruit derived products consist of enough water in it to favor the growth of microbes. It, therefore, is requiredto be added with certain preservative compounds, in order to increase its shelf-life, which could be certain acid or gas.
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Discussion Questions
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Part A: The Effect of Temperature on Enzyme Activity
Graph the volume of oxygen produced against the temperature of the solution.
How is the oxygen production in 30 seconds related to the rate of the reaction?
At what temperature is the rate of reaction the highest? Lowest? Explain.
Why might the enzyme activity decrease at very high temperatures?
Why might a high fever be dangerous to humans?
What is the optimal temperature for enzymes in the human body?
Part B: The Effect of pH on Enzyme Activity
Graph the volume of oxygen produced against the pH of the solution.
At what pH is the rate of reaction the highest? Lowest? Explain.
Why does changing the pH affect the enzyme activity?
Research the enzyme catalase. What is its function in the human body?
What is the optimal pH for the following enzymes found in the human body? Explain. (catalase, lipase (in your stomach),…
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Discussion Questions:
Part One
Why were the plants kept in the dark prior to the experiment? Why is this important?
Why is it important to boil the leaf?
Explain why it was necessary to use boiling alcohol?
What is the purpose of the iodine?
Part Two
What was the purpose of keeping the leaf in the dark and then covering it with a cardboard cut-out?
What conclusions can you draw from this part of the lab?
Part Three
7. In this experiment what was the purpose of adding the soda lime?
8. Why was a sealed bag placed around each plant?
9. What happened in the control plants?
10. What was the result on photosynthesis?
Part Four
11. Why was a variegated leaf used in this experiment?
!2. What conclusions can you draw about starch production in a variegated leaf?
How did the color differences between the two bacterial species you used in this experiment help you determine if the streak plate method you performed was successful?
Chapter 30 Solutions
NESTER'S MICROBIOLOGY: A HUMAN PERSPECT
Ch. 30 -
1. What is the purpose of rennin in...Ch. 30 - What causes bluish-green veins to form in some...Ch. 30 - What causes the holes to form in Swiss cheese?Ch. 30 - Why are starter cultures used when making semidry...Ch. 30 - What is the purpose of the mashing step in...Ch. 30 - Explain how Alcaligenes species cause “ropiness”...Ch. 30 - Explain the significance of Aspergillus flavus in...Ch. 30 - Prob. 8SACh. 30 -
9. Explain the typical sequence of events that...Ch. 30 - How does canning differ from pasteurization? page...
Ch. 30 - Prob. 1MCCh. 30 - Prob. 2MCCh. 30 - What is a generally minimum pH for growth and...Ch. 30 - Prob. 4MCCh. 30 - Prob. 5MCCh. 30 - Prob. 6MCCh. 30 -
7. Which of the following genera is used in...Ch. 30 -
8. Which group of organisms most commonly spoils...Ch. 30 - Prob. 9MCCh. 30 - Canned pickles require less stringent heat...Ch. 30 - Prob. 1ACh. 30 - Prob. 2ACh. 30 - Prob. 1CTCh. 30 -
2. In the production of sauerkraut, a natural...
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