The Cholodny-Went hypothesis has been proposed to explain how plants bend toward a directional light source. What does this hypothesis suggest?
A. Plants use phototropins to receive a blue-light signal.
B. The tip of the plant shoot is important for bending.
C. Auxin is produced in cells in response to light and causes bending.
D. Asymmetric auxin distribution causes differential cell elongation that causes bending.
Ans: D. Asymmetric auxin distribution causes differential cell elongation that causes bending.
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The cavities inside the brain are termed
A. sinuses. B. ventricles. C. cavities. D. sulci.
The finches of the Galápagos islands evolved as a result of what type(s) of speciation?
A. allopatric speciation B. adaptive radiation C. sympatric speciation D. both allopatric speciation and adaptive radiation E. both sympatric speciation and adaptive radiation
What is the best way to promote fusion between two related populations of mosquitofish, one of which lives in a predator-rich pond and the other of which lives in a predator-poor pond?
A) Build a canal linking the two ponds that permits free movement of mosquitofish, but not of predators. B) Transfer only female mosquitofish from a predator-rich pond to a predator-poor pond. C) Perform a reciprocal transfer of females between predator-rich and predator-poor ponds. D) Remove predators from a predator-rich pond and transfer them to a predator-poor pond.
If you wash your skin and hair several times a day, you will soon have dry skin that easily cracks and bleeds because the oils you have removed are necessary to keep the skin supple. This oil is
A. salty sweat secreted by sweat glands. B. lymph secreted by lymphatic ducts. C. pili secreted by arrectors. D. sebum secreted by sebaceous glands. E. sebum secreted by sweat glands.