Which of the following includes most of the bacteria that cause human disease?
a. chemoautotroph
b. chemoheterotroph
c. photoautotroph
d. photoheterotroph
e. chemoautotroph and photoheterotroph
B
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Which pair diverged longer ago from their common ancestor and why?
When comparing the sequences of a homologous gene in four different species, one pair of species shows a 1% difference, whereas the other pair shows a 3% difference. A. The pair with a 1% difference; because a lower difference (1% instead of 3%) has occurred because the common ancestor is younger and more mutations occurred over a shorter amount of time. B. The pair with a 1% difference would have an older common ancestor; A higher difference (1% instead of 3%) has occurred because the common ancestor is older and there has been more time to accumulate mutations. C. The pair with a 3% difference would have an older common ancestor; A lower difference (3% instead of 1%) has occurred because the common ancestor is younger and there has been more time to accumulate mutations. D. The pair with a 3% difference would have an older common ancestor; A higher difference (3% instead of 1%) has occurred because the common ancestor is older and there has been more time to accumulate mutations. E. None of these are correct.
What is the defining characteristic of the Opisthokonts?
a. archaic forms of plastids b. pseudophodia c. single posterior flagellum d. calcium carbonate shells
Runners are modified stems that resemble roots and are also known as ____.
A. stolons B. rhizomes C. bulbs D. corms E. tubers
Haldane pointed out that if he received a certain allele, the chance that one of his brothers would receive that allele would be
A. Random B. 50% C. 0% D. 100% E. 10%