The placement of prokaryotes into major clades within the domains Archaea and Bacteria has been based on __________.
a. molecular comparisons
b. fossil records of prokaryotes that have been recently discovered
c. Gram stain results and colony characteristics when grown on solid media
d. shape and motility
e. nutritional modes and ecology
Ans: a. molecular comparisons
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A(n) ________ consists of the interactions between all of the species in a given area. a. ecosystem b. biome c. community d. None of these choices
e. habitat
Atmospheric pressure increases with altitude
Indicate whether the statement is true or false
Aquatic arthropods that fragment organic particles and also eat bacteria and fungi on the surface of the litter are called
A) shredders. B) filtering collectors. C) gathering collectors. D) grazers.
Which of the following mutagens is most different than the others in terms of its effect on DNA?
A. Base analogue B. Planar mutagen that inserts between stacked bases C. Acridine orange D. Intercalating agent