They attach to the membrane at specific receptor sites. Once attached the virus injects its DNA or RNA into the cell. Enveloped viruses are enclosed in a membrane similar to that of the host cell. The virus and the envelope fuse and the virus enters the cell through endocytosis. To make it easier viruses hijack a cell then they inject their genetic material into the cell and try to take over then it uses the cell to make more
The best explanation is that it occurs because most eukaryotic genes and their RNA transcripts have long non-coding stretches of nucleotides that are not translated.
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Nitrogen-fixing bacteria fix atmospheric nitrogen to ammonia, which can then be taken up by plants.
- The process is called biological nitrogen fixation.
- Rhizobium, Azotobacter, cyanobacteria are some examples of nitrogen-fixing bacteria, which may be free-living or symbiotic.