Many euryarchaeote and crenarchaeote archaeons are ________________, or organisms that thrive in high-temperature environments (some in temperatures as high as 122 °C)
A. hypothermophiles
B. hyperthermophiles
C. halophiles
D. non-halophiles
E. basophiles
F. acidophiles
B
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_________ occur where winter drought reduces photosynthesis and most trees drop their leaves
a. Tropical montane forests b. Tropical deciduous forests c. Boreal forests d. Dry savannas e. Temperate forests
Leukopenia is the ________ in the level of white blood cells in a patient.
A. decrease B. abnormal production C. stabilization D. elevation
In prokaryotes, the RNA polymerase holoenzyme consists of
A. the core polymerase plus two alpha subunits, two beta subunits, and a sigma subunit. B. two alpha subunits, two beta subunits, and two sigma subunits. C. the core polymerase plus two beta subunits. D. the core polymerase plus two alpha subunits. E. the core polymerase plus a sigma subunit.
Which of the following statements about essential nutrients are true? Essential nutrients _____
I) are necessary for plant growth and reproduction II) are required for a specific structure or metabolic function III) cannot be synthesized by a plant IV) are produced by symbiotic bacteria A) I and IV B) II, III, and IV C) I, II, and III D) I, II, III, and IV