Explain the structure of T-even bacteriophages.

* Structure shows Tadpole appearance.
* It contains head (icosahedral) and helical tail joined by collar.
* Inside capsid double stranded DNA is present.
* Around tail core contractile tail sheath is present.
* At the end of tail, basal plate is present.
* Basal plate contains 6 pins and 6 tail fibres which helps in attachment of virus to host cell.