The shape of the lens of the eye can be changed to allow focusing on certain objects at different distances from the head. The structure that produces this shape change is the ________
A) eyelid muscle
B) ciliary body
C) extrinsic muscle
D) papillary muscle
B
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Pathogenic microorganisms and their hosts live in a close association with one another known as:
A. sociality B. mutualism C. parasitism D. commensalism E. biofilms
Two oocytes released from the same ovary at the same time and fertilized by two sperm results in
A) monozygotic twins. B) dizygotic twins. C) blighted ova. D) cloned embryos.
biodegradable
What will be an ideal response?
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