Are all species introductions the fault of humans? What will be an ideal response?
No, species introductions can happen by a number of ways. Seeds can travel on migratory animals,
mature organisms can travel across bodies of water, and at a slower pace the continental drifts can
move species. That being said, humans have accelerated the pace of species introductions to an
alarming rate due to our ability to travel long distances very rapidly.
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Eukaryotic telomeres replicate differently than the rest of the chromosome. This is a consequence of which of the following?
A) the evolution of telomerase enzyme B) DNA polymerase that cannot replicate the leading strand template to its end C) gaps left at the end of the lagging strand D) gaps left at the end of the lagging strand because of the need for a primer E) the "no ends" of a circular chromosome
The DNA of gene X in humans has been isolated, cloned, and sequenced and is 8000 base pairs in length. From cells that were actively transcribing gene X, a cDNA library was made. In this case, gene X was found to produce from an mRNA that was 4200 bases in length. The most probable explanation of these results is that
A) there was no mRNA in the cells of the mRNA used to make the cDNA library. B) the DNA encoded introns that were excised during mRNA processing. C) a mutation resulted in a large loss of this particular gene. D) reverse transcription of the mRNA isolate was not complete. E) none of the above
__________ are open channels that connect the
cytoplasm of abutting cells and permit rapid transfer of ions and small molecules between them. Fill in the blank(s) with the appropriate word(s).
What is the cecum a part of?
A) the mouth B) the large intestine C) the stomach D) the small intestine large intestine