Question

which structure immediately encloses the viral nucleic acid?
o capsid
o cell wall
o envelope

Explanation:

Viruses have a capsid that immediately encloses the viral nucleic - acid. A cell wall is a feature of plant, fungal, and some bacterial cells and not related to viral structure. An envelope (if present in a virus) is an outer - layer that surrounds the capsid, not the first structure to enclose the nucleic acid.

Answer:

capsid