Globally, what is the greatest killer of species?
a. destruction of coral reefs
b. air pollution
c. deforestation
d. water pollution
e. nuclear contamination
C
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Many biologists believe that macroevolution is just an accumulation of microevolutionary events. Does this mean they assume a gradualist perspective over a punctuated one? Why or why not?
What will be an ideal response?
Plants cannot ____ in the dark
a. grow b. respire c. move d. utilize chlorophyll e. sense light
Molecules assisted by carrier proteins may cross a selectively permeable membrane by
A) facilitated diffusion. B) active transport. C) osmosis. D) simple diffusion. E) endocytosis.
It has been recently determined that the gene for Duchenne muscular dystrophy (DMD) is more than 2000 kb (kilobases) in length; however, the mRNA produced by this gene is only about 14 kb long. What is a likely cause of this discrepancy?
A) The introns have been spliced out during mRNA processing. B) The DNA represents a double-stranded structure, whereas the RNA is single-stranded. C) The exons have been spliced out during mRNA processing. D) When the mRNA is produced, it is highly folded and therefore less long. E) There are more amino acids coded for by the DNA than by the mRNA.