CAMPBELL BIOLOGY-MASTERING BIO.ACCESS
CAMPBELL BIOLOGY-MASTERING BIO.ACCESS
12th Edition
ISBN: 9780136486787
Author: Urry
Publisher: SAVVAS L
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Chapter 43.2, Problem 2CC
Summary Introduction

To discuss: Two advantages of memory cells while encountering pathogen for the second time.

Concept introduction:

“B” lymphocytes and “T” lymphocytes are found in the blood. During the first invasion of a specific pathogen, both “B and T” cells divide rapidly and produce numerous identical cell clones. Some cells in that group are short lived, act directly upon the invading pathogen, and destroy them. The remaining cells are long lived, and they have registered the identity of that specific pathogen. They are called memory cells.

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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
What percentage of a drug is eliminated after 4 half-lives? Please round to the nearest percent. Show the math
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Information Storage and the Brain: Learning and Memory; Author: Professor Dave Explains;https://www.youtube.com/watch?v=PQDiUKwXLVI;License: Standard youtube license