On the landmass that became South America
a. monotremes were replaced by marsupials and
early placental mammals starting about 65
million years ago.
b. highly evolved placental mammals radiated
south from North America about 5 million years
ago.
c. many early placental mammals became extinct
in the Pliocene.
d. early placental mammals arose between 130 and
85 million years ago.
e. all of these occurred.
Answer: e
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In R. radiobacter bacteria, the ____ contains bacterial genes that can be directly inserted into a plant's DNA
Fill in the blank with the appropriate word.
RecA is not the only protein that can promote branch migration. One example is called RuvAB. RuvAB:
A. can promote branch migration but the process is very slow. B. contains two donut-shaped RuvA hexamers, related in structure to DnaB helicase, that have nuclease activity. C. cleaves the Holliday intermediate by replacing one RuvA with RuvC. D. can reload DnaB helicase to reprime DNA replication after repair. E. does not require ATP hydrolysis.
The accompanying figure shows the results of Jackson and Cheetham's studies on fossil and living cheilostome bryozoans. What can you infer from these diagrams?
A) Species of bryozoan have tended to persist with very little morphological change. B) Bryozoans have unusually low genetic diversity. C) Bryozoans predominantly evolve by phyletic transformation, or anagenesis. D) Bryozoans have suffered heavily from extinction events on islands. E) It is hard to define bryozoan species because of the presence of so many intermediate forms.
Two or more organisms using a portion of the same resource simultaneously is referred to as resource partitioning
Indicate whether the statement is true or false