Biomass is the total amount of ________ an ecosystem
A) organic matter tied up in the consumers of
B) organic matter tied up in the producers of
C) chemical elements recycled by the detritivores of
D) living organic material in
D
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During alcoholic fermentation, ____________________ is converted into ethanol
Fill in the blank(s) with the appropriate word(s).
Compared with eukaryotic chromosomes, bacterial chromosomes are ________
A) large, mainly organized in single-gene transcription units without introns B) small, with high gene density C) small, mainly organized in single-gene transcription units with introns D) large, triple-helix, Z-DNA, organized in single gene units with introns E) large, mainly organized in polygenic transcription units without introns
The process by which soil bacteria convert NH3 or NH4 to nitrate (NO3-) is called
A. assimilation. B. fixation. C. denitrification. D. nitrification. E. ammonification.
In biological nitrogen-fixation, ____
a. ammonia is converted to nitrogen gas b. nitrogen gas is converted to ammonia c. ammonia is converted to nitrate d. amino acids are linked into proteins in ribosomes e. nitrate is converted to ammonia