Describing bacterial conjugation, which of the following matings is most likely to result in a change from F- to F+?
A) donor F? recipient F+
B) donor Hfr recipient F+
C) donor Hfr recipient F-
D) donor F? recipient Hfr
E) donor F+ recipient F?
Answer: E
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The following bacterial species are all implicated in dental caries EXCEPT
A) Fusobacterium. B) Borrelia. C) Streptococcus. D) Lactobacillus.
The fusion of the nuclei is ____
a. osmosis b. karyogamy c. cytoplasmic streaming d. plasmogamy e. symbiosis
Which biome is characterized by an abundance of trees that lose all of their leaves at a specific time of
year? a. taiga only b. tropical rain forest only c. temperate rain forest only d. temperate deciduous forest only e. both the temperate and tropical rain forests
Which of the following best explains the attraction of water molecules to each other?
A) Nonpolar covalent bond B) Polar covalent bond C) Ionic bond D) Hydrogen bond E) Electron-proton interaction