Which of the following has the greatest potential as a cancer treatment?
A. Find a way to turn on the gene for making telomerase in normal cells, so that the normal cells would soon outnumber the cancer cells.
B. Find a way to turn off the gene for making telomerase in cancer cells, since the cells would stop dividing when the telomeres were gone.
C. Find a way to turn off the gene for making telomerase in all cells in embryos, so that they never develop cancer.
D. Find a way to turn on the gene for making telomerase in cancer cells, since they will be unable to divide if their telomeres are too long.
Ans: B. Find a way to turn off the gene for making telomerase in cancer cells, since the cells would stop dividing when the telomeres were gone.
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Environmental factors that may affect enzyme activity include
A. temperature. B. pH. C. salt. D. temperature, pH, AND salt.
Four of the five stimuli listed below are sign stimuli. Select the exception
a. a smiling human face b. the red spot on the beak of a herring gull c. the open mouth of a peeping baby bird d. a red-colored stimulus that triggers a territorial red-bellied stickleback fish to attack it e. a mother rat picking up young rats and returning them to the nest
Spawning depends on
A) the synchronized release of eggs and sperm into the water. B) copulation. C) the release of a spermatophore into the water. D) internal fertilization. E) asexual reproduction.
How does peer review influence the development of scientific theories?
A. Peer review increases competition among scientists and thus increases the quality of the published work. B. Peer review makes it extremely difficult for work to be published other than earth-shattering scientific theories. C. Peer review allows other scientists to know what is current in their field. D. Careful evaluation of research results by other scientists ensures that only solid and legitimate research results are published, and helps prevent faulty research or false claims from being viewed as scientific fact.