A population of metabolically related microorganisms is called a(n)
A) guild.
B) niche.
C) ecosystem.
D) haplotype.
Answer: A
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Studies of a soybean plant (Glycine max) and the bacterium Bradyrhizobium japonicum have shown
that after the bacterium enters the root, cells of the root cortex begin to divide in response to
a. a flavonoid released by soybean roots. b. nod gene products produced by soybean roots. c. nod gene products produced by the bacterium. d. nitrogen fixation by the bacterium. e. a flavonoid produced by the bacterium.
Which provides a more stable genome, DNA or RNA?
What will be an ideal response?
Organisms capable of nitrogen fixation
a. include some bacteria. b. include some cyanobacteria. c. may live as symbionts with other organisms. d. all of the above.
________ dating involves age-dating fossils with known time periods grouped into four eras that represent distinct ages in the history of the earth.
Fill in the blank(s) with correct word.