Cilia and flagella arise from which of the following cellular components?
a. nucleus
b. Golgi complex
c. centrioles
d. chromosomes
e. nucleolus
C
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The hard mineral defense of silica plates found in some grasses is effective because:
A. silica does not taste good, so herbivores don't feed on the grass that contains it. B. silica is abrasive and it wears down insect mouth parts, so insects feed less efficiently and more slowly. C. silica is a chemical defense that is toxic to most herbivores. D. silica is able to be consumed by herbivores and used to deter their predators. E. silica binds to proteins and prevents their uptake from the guts of herbivores.
The molecule shown above is ____, having ____
a. unsaturated; a carbon-carbon double bond b. saturated; a carbon-carbon double bond c. unsaturated; no carbon-carbon double bonds d. saturated; no carbon-carbon double bonds e. saturated; a carbon-carbon triple bond
Four of the five choices listed below are examples of
directional selection. Select the exception. a. pesticide resistance b. sexual dimorphism c. wing color in peppered moths d. coat color in rock pocket mice e. antibiotic resistance
You add a large amount of XFF to cultured alien liver cells. Which of the following would confirm that XFF is the alien equivalent of human epinephrine?
A) increased cell division B) decreased cell division C) glycogen breakdown D) increased glucose uptake E) insensitivity to insulin