Antigens specifically associate with an antibody's
A. hinge region.
B. heavy chain constant regions only.
C. variable regions of the heavy chains and light chains combined.
D. light chain variable regions only.
E. tail.
C. variable regions of the heavy chains and light chains combined.
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Which one of the following statements about the methylation state of CpG islands is incorrect?
A. Cells can heavily methylate CpG islands of viral DNA sequences in order to restrict their expression. B. Cancer cells often methylate CpG islands in genes that could restrict cell growth. C. The methylation state of CpG islands provides a way to turn genes on or off. D. The methylation state of CpG islands is rigid and will not change over time. E. The methylation state of CpG islands can change in response to the environment.
Which type of species interactions will be harmful to both species involved?
a. Mutualism b. Predation c. Herbivory d. Commensalism e. Interspecific competition
The primary function of the Export-Import Bank is to assist in
a. guaranteeing markets for U.S. importers. b. financing exports from the United States. c. providing foreign currency to U.S. banking institutions. d. reducing tariff rates between trading nations.
Which of the following statements about cancer is false?
(a) Viruses cause some cancers. (b) Tobacco use is responsible for more than 20% of all cancer deaths. (c) A mutation in even a single cancer-critical gene is sufficient to convert a normal cell into a cancer cell. (d) Chemical carcinogens cause cancer by changing the nucleotide sequence of DNA.