
Nester's Microbiology: A Human Perspective
8th Edition
ISBN: 9780073522593
Author: Denise G. Anderson Lecturer, Sarah Salm, Deborah Allen
Publisher: McGraw-Hill Education
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Chapter 11, Problem 1A
Summary Introduction
To analyze:
The reason for concern of regulatory authorities about presence of coliforms in the drinking water with respect to argument made by a student that this concern makes no sense as coliforms are harmless members of our microbiota.
Introduction:
The bacteria that are present inside the body of the higher animals like humans are called as enterobacteria or entries. They are members of the family Enterobacteriaceae. They are found mainly in the intestinal tracts of human
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Discussion Questions
Answer these discussion questions and submit them as part of your lab report.
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 11 Solutions
Nester's Microbiology: A Human Perspective
Ch. 11 -
1. What kind of bacteria might compose the...Ch. 11 - What kind of bacterium might be responsible for...Ch. 11 -
3. Give three examples of energy sources used by...Ch. 11 - Name two genera of endospore-forming bacteria. How...Ch. 11 - How is the life cycle of Epulopiscium species...Ch. 11 -
6. What unique motility structure characterizes...Ch. 11 - In what way does the metabolism of Streptococcus...Ch. 11 - How have species of Streptomyces contributed to...Ch. 11 - What characteristics of Azotobacter species...Ch. 11 - Compare and contrast the relationships of...
Ch. 11 - A catalase-negative colony growing on a plate that...Ch. 11 - All of the following genera are spirochetes except...Ch. 11 - If you examined the acidic runoff from a coal...Ch. 11 -
4. The dormant forms of which of the following...Ch. 11 -
5. If you read that coliforms had been found in a...Ch. 11 - Which of the following genera preys on other...Ch. 11 -
7. All of the following genera are obligate...Ch. 11 - Prob. 8MCCh. 11 - Prob. 9MCCh. 11 -
10. Thermoplasma and Picrophilus grow best in...Ch. 11 - Prob. 1ACh. 11 - A friend who has lakefront property and cherishes...Ch. 11 - Soil often goes through periods of extreme dryness...Ch. 11 - Prob. 2CT
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