All of the petals of a flower are collectively called the
(a) corolla.
(b) stamens.
(c) receptacles.
(d) calyx.
(a) corolla.
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Which of the following is NOT characteristic of endocrine signaling?
a. long-term regulation b. quick, rapid responses c. controlled by both positive and negative feedback d. regulates body growth e. regulates metabolism
Which situation is an example of diversifying selection?
A) A population of moths with white and grey forms lives in a forest containing trees with light and dark bark. B) Because bees prefer dark blue flowers, this color gradually becomes more dominant in a population of plants with a color ranging from light blue to dark blue. C) A population of plants develops all orange fruit instead of a mixture of yellow, red, and orange fruit, due to animals showing a preference for orange fruit. D) Wild cat populations gradually develop spots that allow them to be camouflaged in the dark forest.
Koopmans (1981) transplanted an extra stomach and length of intestine into rats and then joined the major arteries and veins of the implants to the recipients' circulatory systems. He found that food injected into the transplanted stomach and kept there by a noose around the pyloric sphincter:
(a) decreased eating in proportion to both its caloric content and volume (b) increased eating in proportion to both its caloric content and volume (c) did not affect eating (d) produced a conditioned taste aversion for the injected food
Inbreeding depression is caused by:
a. a reduction in fitness caused by deleterious recessives b. random mating c. mutation-selection balance. d. A and B. e. All of the above.