When cells take on specific structure and function, this is called
A. morphogenesis.
B. growth.
C. cleavage.
D. differentiation.
E. fertilization.
Answer: D
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You prepare the first ever karyotype of an endangered species of frog. Upon examination you find that all the chromosomes are metacentric. This is going to make it difficult to identify
A. which is the p arm of the chromosome. B. which is the q arm of the chromosome. C. the unique G banding for each chromosome. D. if the chromosomes are telocentric. E. both the p and q arms of the chromosome.
Cell mediated immunity is mostly the function of
A. cytotoxic T cells. B. B cells. C. helper T cells. D. complement cells. E. mast cells.
What is the metal ion in chlorophyll?
A. iron B. magnesium C. copper D. zinc E. sulfur
Scientists investigating speciation in fruit flies divided a single population of flies into separate populations that each lived in their own cage on one of two food sources: maltose-based food or starch-based food. After several generations, the flies' mate preference was tested, and it was found that flies strongly preferred to mate with other flies that were raised on the same food source. This result suggests that
A. selection on reproductive isolating mechanisms indirectly led to the evolution of different food preferences. B. reproductive isolating mechanisms evolved primarily through genetic drift. C. selection on food source indirectly led to the evolution of reproductive isolating mechanisms. D. different food preferences evolved primarily through genetic drift.