The enzyme terminase is responsible for
a. formation of eukaryotic centromeres.
b. packaging a phage genome into its capsid.
c. the decondensation of eukaryotic chromatin.
d. supercoiling bacterial DNA.
e. formation of eukaryotic telomeres.
Ans: b
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Scientists know that there has been a steady rise in atmospheric CO2 level since 1850 because ________
a. carbon isotope dating techniques indicate that this is so b. pockets of ancient atmosphere remain in Antarctic ice c. graphs of current increases can be extrapolated back in time d. reports by early researchers are stored in libraries
Individuals that are heavy smokers may eventually have trouble clearing the mucous from their lungs because the structures that move fluid along the epithelial lining of the lung become damaged over time. What are these structures called?
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Which of the following is true about the second meiotic division?
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Which of the following best describes the role of regulatory T cells?
A) Regulatory T cells are a kind of helper T cell that stimulates B cells. B) Regulatory T cells stimulate natural killer cells to attack tumors. C) Regulatory T cells are a kind of helper T cell that stimulates cytotoxic T cells. D) Regulatory T cells stabilize and support memory cells. E) Regulatory T cells help limit the immune system response.