Which phylogenetic model proposes that the first eukaryotes originated from a pool of many species of prokaryotes engaged in multiple methods of horizontal gene transfer?

a. tree of life
b. ring of life
c. web of life
d. cloud of life


c. web of life

Biology & Microbiology

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Eukaryotes have ____ type(s) of RNA polymerase.  

A.  two B.  three C.  four D.  one E.  64

Biology & Microbiology

Artemia and Fast Plant™ bioassays can be used to identify

a. cytotoxins. b. herbicides. c. plant growth stimulators. d. all of the above.

Biology & Microbiology

Of the biomes listed, which is best adapted to seasonal fires?

A) Coniferous forests B) Tundra C) Broadleaf forests D) Chaparral

Biology & Microbiology

The cristae of a mitochondrion are critical ________.

Fill in the blank(s) with the appropriate word(s).

Biology & Microbiology