Which of the following statements is FALSE concerning the universal tree of life?
A) Previous versions of the universal tree of life were based largely on fossils and comparative biology, which overlooked the diversity of and relationships between most prokaryotes.
B) The current universal tree of life is supported by multiple genes including SSU rRNA sequences.
C) The current universal tree of life depicts three domains of life, two of which are prokaryotic.
D) The current universal tree of life is based on molecular sequences and completely changes our view of evolutionary relationships between eukaryotic species.
Answer: D
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Woolly mammoths have been extinct for about 10,000 years, but we occasionally find one that has been preserved in Siberian permafrost. Resurrecting these huge elephantlike mammals may be possible by cloning DNA isolated from such frozen remains. Researchers are now studying the DNA of a remarkably intact baby mammoth recently discovered frozen in a Siberian swamp. What are some of the pros and
cons, both technical and ethical, of cloning an extinct animal? What will be an ideal response?
__________ counters the effects of mutation, natural
selection, and genetic drift. Fill in the blank(s) with the appropriate word(s).
Oral infections with herpes simplex virus 1 can lie dormant in nerve cells for years, and when a patient becomes stressed, the virus is released, forming cold sores on the lips. Why would the virus form a cold sore?
a. To allow it to spread to a new host b. So that it can mutate and survive an antibiotic treatments c. To move to another part of the body d. To avoid the immune system e. To warn other people that the host is infected
Which of the following is not associated with mRNA processing in eukaryotes?
A) addition of a 5' methyl guanosine cap B) 3' polyadenylation C) removal of introns D) removal of exons E) removal of exons and introns