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1. What is a limiting nutrient? Is hydrogen a good example of a limiting nutri- ent? Why?

1. What is a limiting nutrient? Is hydrogen a good example of a limiting nutri- ent? Why?

Biology 2e
Biology 2e
2nd Edition
ISBN:9781947172517
Author:Matthew Douglas, Jung Choi, Mary Ann Clark
Publisher:Matthew Douglas, Jung Choi, Mary Ann Clark
Chapter4: Cell Structure
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1. What is a limiting nutrient? Is hydrogen a good example of a limiting nutri- ent? Why? 2. Explain why aerotolerant and microaerophilic microbes can't survive high oxygen levels but they can survive low levels. 3. When looking at the environmental requirements of microbes (pH, oxygen, etc.), the terms "tolerant" and "obligate" are often used. Give one example of why being tolerant is better than being an obligate. 4. How could the routine ingestion of over-the-counter antacids contribute to the formation of ulcers by Helicobacter pylori? 5. Clinical samples from patients must be handled in such a way as to avoid contamination. What are some of the ways a clinical sample can be contam- inated from the time it is taken from the patient to the time it is analyzed in the laboratory?
Transcribed Image Text:1. What is a limiting nutrient? Is hydrogen a good example of a limiting nutri- ent? Why? 2. Explain why aerotolerant and microaerophilic microbes can't survive high oxygen levels but they can survive low levels. 3. When looking at the environmental requirements of microbes (pH, oxygen, etc.), the terms "tolerant" and "obligate" are often used. Give one example of why being tolerant is better than being an obligate. 4. How could the routine ingestion of over-the-counter antacids contribute to the formation of ulcers by Helicobacter pylori? 5. Clinical samples from patients must be handled in such a way as to avoid contamination. What are some of the ways a clinical sample can be contam- inated from the time it is taken from the patient to the time it is analyzed in the laboratory?
Critical Thinking 1. There is a very large difference between the amount of carbon comprising a prokaryotic cell (50%) and the amount of iron (0.25%). Both elements are nec- essary to the cell and the cell would die without either. Why, then, is there such a disparity in how much of each is needed? (Hint: Think of what the ele- ments are used for when composing your answer.) 2. Which type of microbe, a single-celled microbe or a multicellular microbe, will have the broader temperature range over which it can survive? Why? 3. Where might you expect to find a fastidious microorganism living?
Transcribed Image Text:Critical Thinking 1. There is a very large difference between the amount of carbon comprising a prokaryotic cell (50%) and the amount of iron (0.25%). Both elements are nec- essary to the cell and the cell would die without either. Why, then, is there such a disparity in how much of each is needed? (Hint: Think of what the ele- ments are used for when composing your answer.) 2. Which type of microbe, a single-celled microbe or a multicellular microbe, will have the broader temperature range over which it can survive? Why? 3. Where might you expect to find a fastidious microorganism living?
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