Name two biologically important compounds that contain both oxygen andnitrogen. what is the role of nitrogen fixing bacteria?

1. Deoxyribonucleic acid (DNA) and ribonucleic acid (RNA) are the two biologically important compounds that contain both oxygen and nitrogen.

2. There are some bacteria and blue-green algae, which fix the atmospheric nitrogen into soil, thereby increasing the fertility of soil. They are known as biological nitrogen fixers. One such bacterium is Rhizobium, which is found in the root nodules of leguminous plants such as pulses. It lives in symbiotic association with plants and fixes the atmospheric nitrogen in leguminous plants.