Nitrogen-fixing bacteria, in the roots of soybeans, help provide a source of nitrogen to the plants. In exchange, the bacteria obtain food from the plants. The bacteria are converting
A. ammonium (NH4) to nitrate (NO3).
B. nitrate (NO3) to ammonium (NH4).
C. nitrogen gas (N2) to nitrate (NO3).
D. nitrogen gas (N2) to ammonium (NH4).
E. nitrate (NO3) to nitrogen gas (N2).
D. nitrogen gas (N2) to ammonium (NH4).
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Terminal electron acceptors used by Desulfotomaculum include sulfate and sulfite, converted to hydrogen sulfide.
Answer the following statement true (T) or false (F)
Answer the following statements true (T) or false (F)
1. The modification of a limb that was used for walking in a preexisting ancestor to one that is used as a wing for a species today is called proteomics. 2. A bacterial infection such as pneumonia is most likely caused by organisms derived from the kingdom fungi. 3. All genetic mutations are harmful to an organism. 4. Vertical evolution, whereby living organisms evolve from a common ancestor ("tree of life"), is the only mechanism of evolution on Earth.
The cell cycle is a series of events a cell undergoes as it prepares to
A) divide. B) die. C) adhere to another cell. D) pass along a signal.
Which pathogens require a host cell because they aren't able to make proteins on their own?
A) blue-green algae B) bacteria C) protozoans D) viruses