Prescott's Microbiology
11th Edition
ISBN: 9781260211887
Author: WILLEY, Sandman, Wood
Publisher: McGraw Hill
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Chapter 39.3, Problem 2MI
How does H. pylori increase the local pH in its gastric microenvironment?
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Question #5:
Assume that two genes are identified that confer gametophytic facultative apomixis in soybean. The
genes show independent assortment. Recessive alleles at both loci are required for the facultative
apomixis. Facultative apomixis is triggered when the temperature at pollination is above 20 degrees C.
At temperatures below 20 degrees C, all reproduction is sexual, independent of genotype.
A facultative apomict male, capable of producing viable pollen, was crossed with a sexually
reproducing female. Assuming the parents are completely inbred, what are the predicted phenotypic
ratios (apomict: non-apomict) for the F1, F2, and DH (F1-derived) generations at each of the following
temperatures*:
a) 15°C?
b) 25°C?
*for full credit, show crosses and genotypes where appropriate. Remember to position the
female first (left side) in the cross.
Type your answer here:
a. What percentage of a drug is eliminated after 4 half-lives? Please round to the nearest percent.
b. What will happen to elimination of the drug in the previous question if the system is saturated? explain and show any math involved
If you wanted to reduce the difference between peak and trough levels that occur with repeated administration of a drug, how would you adjust the dose and dose interval without changing the plateau concentration (plateau is the average of peak and trough levels)? Select your answers for both dose and interval. Hint: It may be helpful to think about this problem using an example such as food. How would you eat if you wanted to maintain very steady hunger/satiety levels without changing your total caloric intake?
Options:
A. Dose; Increase dose
B. Dose; Decrease dose
C. Dose; Do not change dose
D. Interval; Increase the interval between doses (give the drug less frequently)
E. Interval; Decrease the interval between doses (give the drug more frequently)
F. Interval; Do not change the interval
Chapter 39 Solutions
Prescott's Microbiology
Ch. 39.1 - What organisms serve as the environmental...Ch. 39.1 - How is the M protein also thought to be involved...Ch. 39.1 - Prob. 3MICh. 39.1 - Why do you think chlamydiae differentiate into...Ch. 39.1 - Compare and contrast the means by which people...Ch. 39.1 - Prob. 3CCCh. 39.1 - What are the three major causes of meningitis? Why...Ch. 39.1 - Prob. 5CCCh. 39.1 - How do multidrug-resistant strains of tuberculosis...Ch. 39.1 - Prob. 7CC
Ch. 39.1 - What is the mechanism by which PTx kills host...Ch. 39.1 - Prob. 9CCCh. 39.1 - Prob. 10CCCh. 39.2 - What are the three stages of Lyme disease? What...Ch. 39.2 - Prob. 1CCCh. 39.2 - Prob. 2CCCh. 39.2 - Prob. 3CCCh. 39.2 - Prob. 4CCCh. 39.3 - What are the chief differences between tuberculoid...Ch. 39.3 - How does H. pylori increase the local pH in its...Ch. 39.3 - Prob. 3MICh. 39.3 - Prob. 4MICh. 39.3 - Prob. 5MICh. 39.3 - Prob. 1CCCh. 39.3 - Why do you think the slow growth rate of M. leprae...Ch. 39.3 - Prob. 3CCCh. 39.3 - Prob. 4CCCh. 39.3 - Prob. 5CCCh. 39.3 - Prob. 6CCCh. 39.3 - Prob. 7CCCh. 39.3 - What is the difference between S. aureus and MRSA?Ch. 39.3 - Prob. 9CCCh. 39.3 - Prob. 10CCCh. 39.3 - Prob. 11CCCh. 39.4 - How do the neurological effects of botulinum toxin...Ch. 39.4 - To which E. coli class does the strain 0157:H7...Ch. 39.4 - Prob. 1CCCh. 39.4 - Compare the gastroenteritis caused by Vibrio...Ch. 39.4 - Prob. 3CCCh. 39.4 - Prob. 4CCCh. 39.4 - Prob. 5CCCh. 39.4 - Prob. 6CCCh. 39.4 - Prob. 7CCCh. 39.5 - Prob. 1MICh. 39.5 - Prob. 1CCCh. 39.5 - Prob. 2CCCh. 39.5 - How is ornithosis transmitted?Ch. 39.5 - Prob. 4CCCh. 39.6 - What cells and tissues make up the pseudomembrane?Ch. 39.6 - Prob. 2MICh. 39.6 - In both C. difficileassociated disease and...Ch. 39.6 - Prob. 2CCCh. 39.6 - Prob. 3CCCh. 39.6 - Prob. 4CCCh. 39 - Prob. 1RCCh. 39 - Prob. 2RCCh. 39 - Prob. 3RCCh. 39 - Prob. 4RCCh. 39 - Prob. 5RCCh. 39 - Prob. 1ALCh. 39 - Prob. 2ALCh. 39 - Prob. 3ALCh. 39 - Prob. 4ALCh. 39 - Prob. 5ALCh. 39 - Prob. 6AL
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