Which of the following statements regarding rooted trees is true?
a. A maximum parsimony approach distinguishes among multiple alternative roots that correspond to the same unrooted tree.
b. Any two rooted trees corresponding to the same unrooted tree will require the same number of character changes.
c. The most common approach to rooting a tree is to use an outgroup.
d. A and B.
e. B and C.
E
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Hfr means high frequency of ________, and these cells are capable of transferring genes from their ________ to other cells
A) transformation / chromosome B) transduction / plasmids C) recombination / chromosome D) transduction / chromosome
Bob dreamt he was biking for five hours. The actual time he was in ____ sleep was about ____ min
a. beta; 15?20 b. EEG; 10?15 c. REM; 60?90 d. REM; 10?15 e. EEG; 90
What environmental factor seems to have the most impact on deep-sea, benthic organisms?
a. Low temperatures b. Extreme pressure c. Food availability d. Perpetual darkness
Why has the United States and Europe banned the use of human drugs in animal feeds?
A. Because it raises the price of the meat too high. B. Because it makes the animals grow too large. C. Because it causes infections in the cows and poultry fed them. D. Because it contributes to the growing drug resistance problem. E. All of these choices are correct.