On island A, there is also a species of wind-pollinated plant that is unaffected by the volcano (does not speciate). Why?
What will be an ideal response?
Answers will vary.
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What is the principal substance that mediates phototropism in stems?
a. auxin b. gibberellin c. abscisic acid d. ethylene e. cytokinin
Describe stratification of environmental factors in lakes, and how this changes with eutrophication. Mention how eutrophication changes the location and abundance of different types of microorganisms living in lake systems.
What will be an ideal response?
Females who are "carriers" for hemophilia
a. Theoretically pass the allele for hemophilia to half of their offspring b. Theoretically pass the allele for hemophilia to half of their daughters who become at least "carriers" for this disorder c. All are correct d. Theoretically pass the allele for hemophilia to half of their sons who become hemophiliacs e. Usually do not show any symptoms of hemophilia
Why are slow-twitch muscles dark?
A. They are designed for strength and explosions of energy. B. They have fewer mitochondria. C. They have many more myofibrils per motor unit than fast-twitch fibers. D. They contain myoglobin. E. They need less blood than fast-twitch fibers.