The protein coat of a virus enclosing nucleic acid is called the:

Explanation

A capsid is a protective protein shell made up of subunits called capsomeres, which are arranged in highly specific patterns that determine the overall shape of the virus (helical, icosahedral, or complex). Its main function is to safeguard the viral genetic material (DNA or RNA) from physical damage, enzymatic degradation, and recognition by the host immune system. In addition, the capsid plays an essential role in the infection process, as it helps the virus attach to host cells and facilitates the delivery of nucleic acid into the host. In some viruses, the capsid is further surrounded by an outer lipid membrane called the envelope, but the capsid itself is a universal feature of all viruses.