Which suffix denotes the "order" level of classification for viruses?
A) - virus
B) - virion
C) - viridae
D) - virales
E) Viruses are not classified to the "order" level.
Answer: D
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DNA is different from RNA in that
A) RNA contains an additional oxygen atom on the ribose sugar. B) RNA is made up five bases, whereas DNA is made up of four. C) RNA cannot exist as a double helix. D) in general, RNA molecules are longer than DNA molecules. E) all of the above
In soft-bottom communities deposit feeders dominate
a. where sediments are generally muddy. b. as epifauna on worm tubes. c. as meiofauna. d. where sediments are generally sandy. e. where oxygen levels are low.
Four of the five answers listed below are habitats favoring fossil preservation. Select the exception
a. deserts b. swamp c. tar pits d. seafloor e. caves
Which types of hormones can enter cells and turn specific genes on and off?
a. steroid and peptide hormones b. steroid and thyroid hormones c. thyroid and peptide hormones d. peptide and phospholipid hormones e. steroid and phospholipid hormones