Campbell Biology (10th Edition)

Published by Pearson
ISBN 10: 0321775651
ISBN 13: 978-0-32177-565-8

Chapter 28 - Test Your Understanding - Level 2 - Application/Analysis: 7

Answer

Please see the image. It should be most difficult to design drugs to combat animals and, after that, fungi.
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Work Step by Step

The tree can be obtained from the olive box on p. 604, replacing the three ameoboid branches with the Amoebozoans as a group. The question of drug design difficulty involves phylogenetic closeness— the most difficult design should be for the evolutionarily closest/most similar relative, since such a drug would be more likely to affect humans as well.
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