_______ is responsible for breaking down ozone in the upper atmosphere.
A.
CO2
B.
CH3
C.
CFC
D.
CO4
Answer: C. <p>CFC</p>
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Transition mutations can result from
A. chemical modification of an existing base in the DNA so that in the next round of replication it will pair differently from the unmodified base. B. a small insertion or deletion. C. incorporation of a base analog that exhibits different base-pairing properties from the base it replaces and chemical modification of an existing base in the DNA so that in the next round of replication it will pair differently from the unmodified base. D. incorporation of a base analog that exhibits different base-pairing properties from the base it replaces.
What evolutionary role is served by the redundancy of the genetic code? What will be an ideal response?
Social insect colonies are composed of highly specialized groups called what?
A. ecotypes B. castes C. filial relatives D. species E. clines
You examine a worm that has two genders: males that produce sperm and hermaphrodites that produce both sperm and eggs. The diploid adult has four homologous pairs of chromosomes that undergo very little recombination
Given a choice, the hermaphrodites prefer to mate with males, but just to annoy the worm, you pluck a hermaphrodite out of the wild and fertilize its eggs with its own sperm. Assuming that all the resulting offspring are viable, what fraction do you expect to be genetically identical to the parent worm? Assume that each chromosome in the original hermaphrodite is genetically distinct from its homolog. (a) all (b) none (c) 1/16 (d) 1/256