Agrobacterium, a tumor-producing bacterium that infects plants, has been of rece

Question

Agrobacterium, a tumor-producing bacterium that infects plants, has been of recent interest because of its possible use as a vector for genetically engineering plants. Select one: O True False The vast majority of microorganisms found in soils have been cultivated in the laboratory Select one: O True False All nitrogen fixers live in associations with plants. Select one: O True False Nitrification is the conversion of ammonia to nitrite ions, followed by the conversion of nitrite into nitrate. Select one: O True False

Explanation / Answer

1)TRUE-

Agrobacterium have been known as plant pathogens from a long time ago but from only past two decades we found the ability of agrobacterium species to transfer DNA to plant cells been harnessed for the purpose of plant genetic engineering.

2)FALSE

The bacteria that can be grown in the laboratory are only a small fraction of the total diversity that exists in nature.At all levels of bacterial phylogeny,uncultured clades that donot grow on standard media are playing critical role in cycling carbon ,nitrogen etc.

3)FALSE

Free living bacteria that donot create any symbiotic relationships with plants to survive and replicate.examples include cyanobacteria,anabena and nostoc and genera genera such as azotobacter and clostridium.

4)TRUE

Nitrification is a process by which bacteria in soil and water oxidize ammonia and ammonium ions and form nitrites and nitrates.Because the nitrates can be absorbed by more complex organisms,as by the root of green plants,nitrification is an important step in nitrogen cycle.

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