Campbell Biology In Focus, Loose-leaf Edition (3rd Edition)
Campbell Biology In Focus, Loose-leaf Edition (3rd Edition)
3rd Edition
ISBN: 9780134895727
Author: Lisa A. Urry, Michael L. Cain, Steven A. Wasserman, Peter V. Minorsky
Publisher: PEARSON
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Chapter 36, Problem 9TYU

FOCUS ON EVOLUTION

Hermaphroditism is more often found in animals that are fixed to a surface than in motile species. Explain why.

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What is a dauer larva ? It's a larva from a special variant of C. elegans that was first identified in samples from soil in Germany It is a larva that shows accelerated development in highly nutritious environments Dauer is just the technical term for "hermaphrodite" - so dauer larva means hermaphrodite adult It's a larva that arrests development in a low metabolic and enduring stage, caused by harsh environmental conditions. The larva will remain in the dauer stage until the conditions improve, at which point they'll resume development.
Describe the feeding process of a sponge. Make sure to use the following vocabulary in your answer: spongocoel, choanocytes, phagocytosis. What are some possible functions of spicules and spongin? How are these sponge parts alike and different? Why is sexual reproduction beneficial for sponges (or other organisms)? When could asexual reproduction be beneficial?
In sea urchin, which step of egg and sperm recognition involves the formation of a fertilization cone?   Sperm binding to the egg's vitelline membrane   Fusion of the sperm and egg membranes   Acrosomal reaction   Chemo-attraction   Sperm binding to the egg's jelly coat
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