In a salt-wedge estuary the relationship between salinity and depth is that salinity:
a. is even from top to bottom.
b. increases with depth.
c. changes abruptly with depth.
d. varies horizontally.
e. decreases with depth.
B
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Why is energy lost when herbivores eat primary producers?
A) Primary producers have energy stored in indigestible substances. B) Primary producers cannot produce once eaten. C) Digestion takes place so rapidly that very little energy is absorbed. D) Most primary producers contain no usable energy for herbivores.
Almost all cases of cystic fibrosis, a(n) ____ genetic disorder, are the result of mating between two unaffected parents
a. mitochondrial b. autosomal dominant c. autosomal recessive d. X-linked dominant e. X-linked recessive
High frequencies are detected by hair cells near the base of the cochlea
____________________ Indicate whether the statement is true or false.
Chemotherapy often produces hair loss and nausea. What aspect of the treatment impacts these normal nontarget tissues?
a. The cells that form the hair follicle and line the digestive system have receptors similar to those found on tumor cells and bind the chemotheraputic agents just as the tumor cells do. b. All body cells take up the chemotherapeutic drugs but the cells that need to go through the cell cycle repeatedly, like hair cells and tumor cells, are inhibited from doing so. c. Cells that are damaged by chemotherapy are nonmutated versions of the tumor cells; both the normal and tumor cells retain their sensitivities to the chemotherapy and are equally affected. d. Oncologists have no satisfactory explanation for the observation, but are working aggressively to minimize these and other unintended effects.