In a cell dividing by meiosis, DNA is replicated
A. during prophase II.
B. during prophase I.
C. before meiosis I.
D. between meiosis I and again before meiosis II.
C. before meiosis I.
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Tropical climates are warmer than temperate climates because
A. temperate climates have more mountains and thus more snow causing the landmasses to warm slower. B. tropical climates have more vegetation and thus can absorb more heat. C. temperate climates are closer to the poles and the polar surfaces cause a reduction in heat gain. D. tropical climates receive the sun's rays at an almost perpendicular angle; since Earth is a sphere, the temperate climates receive the sun's rays at a much steeper incidence thus spreading the radiation over a broader area. E. tropical climates receive the sun's rays at a much steeper incidence thus spreading the radiation over a broader area and causing the tropics to be warmer while the temperate climates receive the sun's rays at an almost perpendicular angle, which causes some areas to be warm and other areas to be cold.
When cells stop responding to normal controls over growth and division they
a. begin to form a tumor. b. produce a malignancy. c. start to die. d. kill surrounding cells. e. produce scar tissue.
Tumor suppressor genes function to
A) prevent gene expression of oncogenes. B) prevent release of growth factors. C) slow down unchecked cell growth, differentiation, division, or adhesion. D) produce proto-oncogenes. E) stimulate metastasis.
As the size of a cell increases,
A. the surface area increases faster than the volume. B. the surface area and the volume increase at the same rate. C. the volume increases faster than the surface area. D. there is no relationship between surface area and volume.