BIOLOGY >PRINT UPGRADE<
BIOLOGY >PRINT UPGRADE<
11th Edition
ISBN: 9780357091586
Author: Solomon
Publisher: CENGAGE L
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Chapter 31.1, Problem 4C
Summary Introduction

To explain: The ways in which ctenophores are similar to cnidarians.

Introduction: Ctenophores are free-swimming, marine organisms. There are approximately 150 species of ctenophores present. Bioluminescence is well-marked in ctenophores. They possess tissue level of organization and are diploblastic. Body wall of ctenophores consists of three layers, namely outer epidermis, inner gastro-dermis, and middle mesogloea.

The phylum cnidaria comprises of approximately 9000 species. It includes hydra, jellyfishes, sea anemones, corals, and others. Most of them are predominately marine and others are freshwater. The body is composed of only two layers of cells. The body exhibits radial symmetry. Cnidarians possess ‘cnidocytes’.

Summary Introduction

To explain: The ways in which ctenophores are different from cnidarians.

Introduction: Ctenophores are free-swimming, marine organisms. There are approximately 150 species of ctenophores present. Bioluminescence is well-marked in ctenophores. They possess tissue level of organization and are diploblastic. Body wall of ctenophores consists of three layers, namely outer epidermis, inner gastro-dermis, and middle mesogloea.

The phylum cnidaria comprises of approximately 9000 species. It includes hydra, jellyfishes, sea anemones, corals, and others. Most of them are predominately marine and others are freshwater. The body is composed of only two layers of cells. The body exhibits radial symmetry. Cnidarians possess ‘cnidocytes’.

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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

Chapter 31 Solutions

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