James noonan and his colleagues (2005. science 309: 597–599) set out to study genome sequences of an extinct species of cave bear. they extracted dna from 4‑year‑old bones from a cave bear and used a metagenomic approach to isolate, identify, and sequence the cave bear dna. why did they use a metagenomic approach when their objective was to sequence the genome of one species, the cave bear?

well, that's easy; the answer's c, "it reduces contamination of the water and substrate of the estuary."

the answer is: trichonympha lives in the gut of termites and digests cellulose eaten by the termite.

this is an example of a symbiotic association of a protozoan with its mode of association.

hope i

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lesson summarykaryotypes a genome is the full set of all the genetic information that an organism carries in its dna. chromosomes arebundles of dna and protein found in the nucleus of a eukaryotic cell.