A population of metabolically related microorganisms is called a(n)

A) guild.
B) niche.
C) ecosystem.
D) haplotype.


Answer: A

Biology & Microbiology

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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.

Biology & Microbiology

Which provides a more stable genome, DNA or RNA?

What will be an ideal response?

Biology & Microbiology

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.

Biology & Microbiology

________ 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.

Biology & Microbiology