Which of the following represents a kingdom?
a. Animalia
b. Chordata
c. Canis
d. Canidae
e. Mammalia
A
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According to the redundancy hypothesis, species are redundant if
A. they could be eliminated or replaced by others with no loss of ecosystem function. B. they have grown beyond their carrying capacity for a particular ecosystem. C. their ecological niche overlaps somewhat with another species. D. they have an effect on the ecosystem that is disproportionate with their abundance.
Protobionts produced by abiotically produced polypeptides are called:a
prokaryotes. b. stromatolites. c. microspheres. d. peptidebionts. e. polybionts.
In a transmission electron microscope, the "lenses" are
A) made of glass. B) thin films of metal. C) lasers. D) magnets. E) vacuums.
The Xist gene product
A. is required for the production of Barr bodies. B. is never translated into protein. C. associates with proteins to compact the chromosome. D. coats the X chromosome with RNA. E. All of these statements are correct.