Final answer:
The statement 'A viroid is a completely developed infectious agent composed of nucleic acid and surrounded by a capsid' is false because a viroid is not surrounded by a capsid.
Step-by-step explanation:
The statement that a viroid is a completely developed infectious agent composed of nucleic acid and surrounded by a capsid is false. A virion is an individual virus particle outside of a host cell and is generally composed of a nucleic acid core surrounded by a protective capsid, which is made of protein subunits called capsomeres. However, a viroid is a plant pathogen that consists solely of a short strand of circular, single-stranded RNA and lacks a protein coat or capsid, which distinguishes it from a virus.
complete question:
A viroid is a completely developed infectious agent composed of nucleic acid and surrounded by a capsid. True/False