Explanation
The outermost sheath of TMV (Tobacco Mosaic Virus) is termed as a "capsid." The capsid is a protein coat that surrounds the genetic material (RNA) of the virus. It protects the RNA from the environment and helps the virus to enter host cells. Peplomeres are structures found on the surface of some viruses, particularly enveloped viruses, and they help the virus attach to and enter host cells. Plasmids, on the other hand, are genetic elements found in some bacteria and eukaryotic cells that can replicate independently of the host cell's chromosomal DNA. Virion is a term used to describe a complete virus particle that is able to infect host cells.
