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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In contrast to regulators, animals that are conformers
A. are able to alter their immediate external surroundings in order to maintain homeostasis. B. require large stores of ATP to maintain homeostasis. C. have an internal body composition that varies along with external changes. D. cannot live in extremely cold environments, such as the Antarctic Ocean. E. cannot adapt to the external environment.
In snapdragons the red allele CR is incompletely dominant over the white allele CW. Which two plants
would you cross to produce a true-breeding pink snapdragon?
a. pink with pink b. pink with red c. red with white d. pink with white e. it's impossible to accomplish
Any change in allele frequencies in a gene pool
is
a. natural selection. b. macroevolution. c. microevolution. d. mutation. e. artificial selection
The promotion of the lactose operon in
bacteria is a. activated by a repressor protein. b. independent of glucose concentration. c. activated by t lactose binding. d. regulated by RNA polymerase. e. none of these