Biology (MindTap Course List)
10th Edition
ISBN: 9781285423586
Author: Eldra Solomon, Charles Martin, Diana W. Martin, Linda R. Berg
Publisher: Cengage Learning
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Chapter 55.3, Problem 8LO
Discuss the effects of fire on certain ecosystems.
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engineered constructs that consist of hollow fibers are acting as synthetic capillaries, around which cells have been loaded. The cellular space around a single fiber can be modeled as if it were a Krogh tissue cylinder. Each fiber has an outside “capillary” radius of 100 µm and the “tissue” radius can be taken as 200 µm. The following values apply to the device:R0 = 20 µM/secaO2 = 1.35 µM/mmHgDO2,T = 1.67 x 10-5 cm2/secPO2,m = 4 x 10-3 cm/secInstead of blood inside the fibers, the oxygen transport and tissue consumption are being investigated by usingan aqueous solution saturated with pure oxygen. As a result, there is no mass transfer resistance in the synthetic“capillary”, only that due to the membrane itself. Rather than accounting for pO2 variations along the length ofthe fiber, use an average value in the “capillary” of 130 mmHg.Is the tissue fully oxygenated?
Molecular Biology
Please help with question. thank you
You are studying the expression of the lac operon. You have isolated mutants as described below. In the presence of glucose, explain/describe what would happen, for each mutant, to the expression of the lac operon when you add lactose AND what would happen when the bacteria has used up all of the lactose (if the mutant is able to use lactose).5. Mutations in the lac operator that strengthen the binding of the lac repressor 200 fold
6. Mutations in the promoter that prevent binding of RNA polymerase
7. Mutations in CRP/CAP protein that prevent binding of cAMP8. Mutations in sigma factor that prevent binding of sigma to core RNA polymerase
Molecular Biology
Please help and there is an attached image. Thank you.
A bacteria has a gene whose protein/enzyme product is involved with the synthesis of a lipid necessary for the synthesis of the cell membrane. Expression of this gene requires the binding of a protein (called ACT) to a control sequence (called INC) next to the promoter.
A. Is the expression/regulation of this gene an example of induction or repression?Please explain:B. Is this expression/regulation an example of positive or negative control?C. When the lipid is supplied in the media, the expression of the enzyme is turned off.Describe one likely mechanism for how this “turn off” is accomplished.
Chapter 55 Solutions
Biology (MindTap Course List)
Ch. 55.1 - Summarize the concept of energy flow through a...Ch. 55.1 - Explain typical pyramids of numbers, biomass, and...Ch. 55.1 - Distinguish between gross primary productivity and...Ch. 55.1 - VISUALIZE Draw a diagram tracing energy flow...Ch. 55.1 - What are trophic levels, and how are they related...Ch. 55.1 - How do gross primary productivity (GPP) and net...Ch. 55.2 - Describe the main steps in each of these...Ch. 55.2 - What are the roles of the following processes in...Ch. 55.2 - VISUALIZE Draw a diagram showing the five steps in...Ch. 55.2 - How does the phosphorus cycle proceed without a...
Ch. 55.3 - Summarize the effects of solar energy on Earths...Ch. 55.3 - Discuss the roles of solar energy and the Coriolis...Ch. 55.3 - Give two causes of regional precipitation...Ch. 55.3 - Discuss the effects of fire on certain ecosystems.Ch. 55.3 - What basic forces determine the circulation of the...Ch. 55.3 - What basic forces produce the main ocean currents?Ch. 55.3 - Prob. 3CCh. 55.4 - Briefly describe some of the long-term ecological...Ch. 55.4 - Prob. 1CCh. 55 - The movement of matter is _______________ in...Ch. 55 - A complex of interconnected food chains in an...Ch. 55 - The quantitative estimate of the total amount of...Ch. 55 - Which of the following equations shows the...Ch. 55 - Which of the following processes increase(s) the...Ch. 55 - In the nitrogen cycle, gaseous nitrogen is...Ch. 55 - Test Your Understanding 7. The conversion of...Ch. 55 - Which biogeochemical cycle does not have a gaseous...Ch. 55 - Test Your Understanding 9. Which of the following...Ch. 55 - Test Your Understanding 10 The periodic warming of...Ch. 55 - Test Your Understanding 11 A mountain range may...Ch. 55 - VISUALIZE Draw the simplest stable ecosystem you...Ch. 55 - PREDICT How might a food web change if all...Ch. 55 - Why is the cycling of matter essential to the...Ch. 55 - What would happen to the nitrogen cycle if all...Ch. 55 - Test Your Understanding 16 Would the microclimate...Ch. 55 - Test Your Understanding 17 INTERPRET DATA Examine...Ch. 55 - INTERTRET DATA Scientists have compiled databases...Ch. 55 - SCIENCE, TECHNOLOGY, AND SOCIETY How do humans...
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