If an element has 7 electrons how many orbital shells will it form?
a. 1
b. 3
c. 5
d. 2
e. 4
d
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Nearsightedness is also called
(a) myopia. (b) hyperopia. (c) presbyopia. (d) none of the above
About 50% of the world's commercial fish supply comes from areas of:
a. deep submarine canyons. b. atolls. c. benthic outer-edge of the continental shelf. d. upwelling. e. mid-ocean ridges.
Why do some physicians advise patients with a bladder infection to drink a lot of cranberry juice?
A) Cranberry juice contains chemicals that kill viruses and bacteria. B) The increased volume of fluid in the bladder causes bacterial cells to burst as they absorb the excess fluid. C) Cranberry juice makes the urine more acidic, decreasing the rate at which microorganisms can grow and reproduce. D) Cranberry juice increases the efficiency of urine production by the kidneys. E) Cranberry juice enhances the action of phagocytic cells.
All of the statements below are true. Select the statement that best supports the view of most biologists that viruses are nonliving.
a) The viral genome may be single-stranded or double-stranded RNA or DNA. b) Viruses are obligate intracellular parasites. c) An isolated virus is unable to replicate its genes or regenerate ATP.