Which of the following is one of the compelling lines of evidence for the endosymbiont theory?
a. Mitochondria have their own genomes.
b. Alpha-proteobacteria are often symbiotic with plants.
c. Cell walls were present in prokaryote precursors.
d. DNA is coiled around histone proteins.
a. Mitochondria have their own genomes.
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A certain species of pine tree survives only in scattered locations at elevations above 2800 meters in the western United States. To understand why this tree grows only in these specific places, an ecologist should _____
A) conclude that lower elevations are limiting to the survival of this species B) study the anatomy and physiology of this species C) investigate the various biotic and abiotic factors that are unique to high altitude D) analyze the soils found in the vicinity of these trees, looking for unique chemicals that may support their growth E) collect data on temperature, wind, and precipitation at several of these locations for a year
Where in the eudicot plant root would you expect to find vascular tissue?
A. in the center B. near the edge C. between the ground and dermal tissue D. scattered in the root E. parallel to the edge
While examining a blood sample for the presence of Trypanosoma cruzi, you are able to distinguish an anterior flagellum but, because of the poor resolution of the microscope you are using, cannot tell if an undulating membrane is present or not. Which stages of the hemoflagellate may be present?
> Amastigote > Promastigote > Epimastigote > Trypomastigote
On what basis was life divided into three domains?
A. cytochrome c sequence data B. the presence or absence of a nucleus and organelles C. presence or absence of mammary glands D. rRNA sequence data E. mitochondrial DNA sequence data