The small molecule cyclic AMP (cAMP) takes about 0.2 second to diffuse 10 ?m, on average, in a cell
Suppose that cAMP is produced near the plasma membrane on one end of the cell; how long will it take for this cAMP to diffuse through the cytosol and reach the opposite end of a very large cell, on average? Assume that the cell is 200 ?m in diameter.
(a) 4 seconds
(b) 16 seconds
(c) 80 seconds
(d) 200 seconds
(c)
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In the figure above, which DNA fragment is the smallest?
a. A b. B c. C d. D e. E
This part of the brain coordinates motor
activity for moving limbs and maintaining posture. This part of the brain is the
a. cerebrum. b. cerebellum. c. medulla oblongata. d. pons. e. hypothalamus
The organ of Corti is a
a. chemoreceptor. b. mechanoreceptor. c. photoreceptor. d. nociceptor. e. osmoreceptor
Why do the Galápagos Islands and the Hawaiian Islands have so many endemic species of flies and birds? Check all that apply.
A. There are numerous islands in each archipelago. B. Each bird or fly species has many common ancestors. C. There is adequate distance between islands to allow divergence. D. The founder effect was common when islands were colonized.