Plasmids are
A) noncircular DNA segments found only in bacteria.
B) necessary for bacteria to reproduce.
C) found only in three species of bacteria.
D) chromosomal loops made of RNA.
E) small, replicating rings of DNA found in bacteria.
E
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The biological species concept states that species are actually or potentially ____ populations that are ____ from other such groups
Fill in the blank with the appropriate word.
What causes the annual growth rings of trees?
A. Residual bark left over when the trunk of the tree expands B. Damage caused by fungi that occurs during the wetter months C. Different growth rates at different times of the year D. Sugars left over from the previous summer
The rapid evolution of bacteria and fungi in certain environments is used in the field of:
a. bioremediation. b. human disease genetics. c. medical diagnostics. d. human genome sequencing. e. plant genomics
Which of the following is mismatched?
A) CO2 + 4H2 ? CH4 + 2H2O — Methane-producing bacteria B) 2 NO2- + O2? 2 NO3 — Nitrobacter C) 6CO2 + 6H2O ? C6H12O6 + 6O2 — Clostridium D) N2 + 6H+ ? 2NH3 — Beijerinckia E) SO42- + 10H+ ? H2S + 4H2O — Desulfovibrio