You are building a phylogenetic tree to study the relationships between protists that live in termite guts. You find that the protists you're studying readily adapt to different environments through similar morphological means. Because of this, you're worried that any similarities between the protists are due to convergent evolution. What's the best kind of method to use to construct your tree?
A. parsimony
B. bootstrapping
C. maximum likelihood
Answer: C. maximum likelihood
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Which of the following statements about the 5' end of a polynucleotide strand of RNA is correct?
A) The end has a hydroxyl group attached to the number 5 carbon of ribose. B) The end has a phosphate group attached to the number 5 carbon of ribose. C) The end has phosphate attached to the number 5 carbon of the nitrogenous base. D) The end has a carboxyl group attached to the number 5 carbon of ribose. E) The end is the fifth position on one of the nitrogenous bases.
Why do scientists consider HIV to be an emerging virus?
A) HIV infected humans long before the 1980s, but it has now mutated to a more deadly form. B) HIV mutates rapidly making the virus very different from HIV in the early 1980s. C) HIV suddenly became apparent and widespread in the 1980s. D) HIV is now starting to cause diseases other than AIDS, such as rare types of cancers and pneumonias.
In a hypertonic environment, an animal cell will do which if the following?
a. swell b. stay the same size c. shrink d. cannot be determined
Which of the following proteins is central to starvation survival strategies in many bacteria?
A. ATPase B. Fts Z C. Superoxide dismutase D. RpoS