Compare and contrast methanogens and methane oxidizers, including their roles in the environment
What will be an ideal response?
Methanogens are archaea (in the phylum Euryarchaeota), and methane oxidizers are bacteria of the phylum Proteobacteria, so they are fundamentally different in all the ways these two domains differ. The methanogens produce methane gas from organic materials, and the bacterial methane oxidizers metabolize methane gas to produce organic compounds and cellular energy. Both types of prokaryotes live in anaerobic environments and often grow in proximity to each other. Thus, their metabolic activities with respect to methane are complementary and contribute to recycling of biomolecules.
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In bacterial cell division, the cell divides into two nearly equal halves. This process is referred to as
A. binary fission B. meiosis C. cytokinesis D. fusion E. mitosis
You perform an experiment by incubating a radiolabeled nucleotide into the medium of a culture of cells. The cells that take up the radiolabel would be expected to be in what phase of the cell cycle?
a. S phase b. G1 phase c. G2 phase d. M phase
Which of the following groups contains the fewest number of species?
A) Kingdom B) Phylum C) Domain D) Class E) Order
Substances contained in food that are necessary for good health are called:
What will be an ideal response?