Blood pH is kept near a value of 7.3-7.5 because of
a. salts.
b. buffers.
c. acids.
d. bases.
e. water.
Answer: b
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In addition to eutrophication in lakes, which process is being caused by excess nutrients in rivers?
A. warming of the water in the Gulf of Mexico B. introduction of exotic species like Zebra mussels C. the dead zone in the Gulf of Mexico D. decreased plant growth E. clogging of city water lines
If both homologous chromosomes of each pair exist in the same nucleus, that nucleus is
a. diploid. b. unable to undergo meiosis. c. haploid. d. none of the above.
Which part of the globe is responsible for the largest increase in NPP?
A) the Arctic B) the United States C) the Amazon rain forest D) North Africa
A type of asexual reproduction in angiosperms involving meiosis with no chromosome pairing and meiosis II does not occur is called
a. apomixis b. syngamy c. apogamy d. meiogenesis e. parthenogamy