Microcheck 116

Bacillus and Clostridium species produce endospores, the most resistant life form known. Azotobacter species, myxobacteria, and Streptomyces species all produce dormant forms that tolerate some adverse conditions but are less resistant than endospores. Agrobacterium species and rhizobia derive nutrients from plants, although the former are plant pathogens and the latter benefit the plant.

■ How does an endospore differ from a cyst of Azotobacter?

■ How does Agrobacterium derive a benefit from inducing a plant tumor?

■ If you wanted to determine the number of endospores in a sample of soil, what could you do before plating it?

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