The connection between stem cells and cancer is that
A) all stem cells are also cancer cells.
B) cells may become cancerous by expressing "stemness" genes.
C) stem cells rescue cells that have become cancerous.
D) both stem cells and cancer cells have inactivated telomerase.
B) cells may become cancerous by expressing "stemness" genes.
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If the Earth were to reorient such that the North Pole always received direct sunlight (always faced the Sun), how would that change Earth's climate?
A) The equators would not change in climate. B) The South Pole would get colder. C) The equators would get warmer. D) The North Pole would get more wind.
The plastids of kelps and other brown algae arose through secondary endosymbiosis. What modern organisms are most closely related to the type of cell that eventually became these plastids?
A. cyanobacteria B. Chlamydomonas (a single-celled green alga) C. Trypanosoma (a kinetoplastid) D. dinoflagellates E. coccolithophorids
The positive control of the lactose operon in bacteria
is a. activated by a repressor protein. b. independent of glucose concentration. c. activated by allolactose d. regulated by RNA polymerase. e. none of these.
Calcium carbonate shells and thread-like pseudopods are characteristic of
A) euglenids. B) alveolates. C) foraminiferans. D) excavates. E) radiolarians.