The field of epigenetics has opened the way for the development of a new class of anticancer drugs ____
a. that are very similar to many chemotherapy treatments but are much more targeted and effective
b. that stop mutations before they occur in individuals with a predisposition to certain kinds of cancer
c. that increase the level of methylation in cancer cells
d. used specifically to treat breast cancer because the key genes involved in this cancer cannot be epigenetically modified
e. because of the discovery that epigenetic modification of key genes is important in some cancers and the fact that epigenetic changes are reversible
e
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Lichens are mutualisms between
A. yeast and another fungi. B. fungi and an alga. C. fungi and a green plant. D. fungi and a mycorrhizae. E. mycorrhizae and yeast.
Three species of tigers have become extinct due to overharvesting or habitat destruction. This is an example of
A. mass extinction. B. background extinction rate. C. sympatric speciation. D. increased extinction rate by human activity. E. allopatric speciation.
A couple is having difficulty conceiving a child, and they decide to see a fertility specialist. Which two organ systems will the specialist examine in this couple?
A. reproductive and nervous systems B. reproductive and urinary systems C. reproductive and endocrine systems D. endocrine and urinary systems
What is it about carbon-12, carbon-13, and carbon-14 that makes them all carbon?
A) They all have the number of protons plus neutrons that is characteristic of carbon. B) They all have the number of neutrons that is characteristic of carbon. C) They all have the number of protons that is characteristic of carbon. D) They all are radioactive. E) They all are elements.