This sequence of questions is designed to help students understand the critical role bacteria and archaea play in the sulfur and nitrogen biogeochemical cycles. No one organism can perform all the reactions in the cycle
Some of these reactions are solely catalyzed by
microbes, solidifying their necessity and importance in supporting all life on Earth.
Consider the chemical reactions of the sulfur cycle shown in Figure 26.10 and the nitrogen
cycle shown in Figure 26.11.
Oceans constitute the most significant reservoir of sulfur in the biosphere, and sulfate (SO4
2-
) reduction is the most predominant form of anaerobic respiration in marine environments. In
such cases, oxidized sulfur compounds like SO4
2- are the electron acceptors instead of
what?
A. water
B. oxygen
C. hydrogen
D. carbon dioxide
B
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You identify a new unicellular organism with multiple chromosomes organized by proteins within the cell's nucleus. Into which of the three domains of life might this organism fit?
A) Archaea B) Bacteria C) Eukarya D) Archaea or Bacteria E) Archaea or Eukarya
Identify two vitamins and two minerals, and provide a one-sentence explanation for the functions of
each. What will be an ideal response?
Describe the miRNA-mediated pathway for degradation of eukaryotic mRNAs
What will be an ideal response?
The names of the three proposed domains are: Bacteria, Protista, Eukarya.
Answer the following statement true (T) or false (F)