Answer:
In nitrogen cycle the symbiotic bacteria in the roots of many plants play an important role.
Explanation:
During fixation of atmospheric nitrogen into ammonia various nitrogen fixing bacteria such as azobactor, clostridium forms symbiotic association with root nodules of many leguminus plants.
The root nodules of leguminus plants contain leg hemoglobin which is very much sensitive to the presence of oxygen.
Nitrogen fixation is carried out by two important enzymes reductase and nitrogenase.
They determine the inherited traits of an organism.
The order for the necessary enzymes that act to repair a thymine dimer by nucleotide excision repair is Endonuclease, DNA polymerase I, DNA ligase. Thymine dimer repair may be done by two mechanisms; Photoreactivation repair, the pre enzyme activated by blue light breaks the dimer restoring the normal base pairing. The other method is excision repair; where the uvr system excises the dimer, and the gap is filled in by the proof-reading activity of DNA polymerase I.
The chloroplast
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