Which one of these is a nitrite?
a. NH4-
b. NO3-
c. NO2-
d. PO4-
e. NH2
Answer: c. NO2-
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In peripheral countries, a greater percentage of the labor force is engaged in primary and secondary activities than in tertiary and quaternary activities
Indicate whether this statement is true or false.
Miescher discovered phosphorus in DNA taken from
A) bacteria. B) viruses. C) soiled bandages. D) dead mice.
The decline in the occurrence of sickle-cell anemia in the American population is most likely the result
of
a. a lower mutation rate in the United States than in Africa. b. the advantage of both homozygous forms over the heterozygous form. c. the development of appropriate medical treatment for the sickle-cell condition in the United States. d. a decline in the occurrence of malaria in the United States. e. the absence of mosquitoes.
One significant difference between spermatogenesis and oogenesis is that
A. females produce only one gamete during their lifetime. B. males produce sperm cells only between thirteen and forty. C. the size of resulting cells is different. D. the placement of the gonads does not influence viability in males, but does in females.