Tropical areas absorb more heat than they lose and polar areas lose more heat than they gain. How is it that the tropics do not continue to get warmer and the poles don't get colder with time?
What will be an ideal response?
Excess heat that is gained in the tropics is transferred to the poles by winds and ocean currents, which act as giant heat conveyors on the planet.
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A strain of bacteria containing F? factor genes is called a
A. monozygote. B. heterozygote. C. homozygote. D. merozygote. E. hemizygote.
The ends of chromosomes in human cells are "capped" with special repetitive DNA sequences called
A. suppressor genes. B. oncogenes. C. telomeres. D. centromeres. E. radiata.
Four of the five events listed below are related by
a common phase of mitosis. Select the exception. a. beginning of microtubule assembly outside the nucleus b. division of centromere c. disappearance of nucleolus d. disappearance of nuclear membrane e. shortening and condensation of chromosomes make them more visible
Which of the following mutagens is most different than the others in terms of its effect on DNA?
A. Base analogue B. Planar mutagen that inserts between stacked bases C. Acridine orange D. Intercalating agent