Which of the following statements is wrong for viroids?
(1) They are smaller than viruses
(2) They cause infections
(3) Their RNA is of high molecular weight
(4) They lack a protein coat
(3) Viroids are infectious, non-protein-coding, highly structured with samll circular RNA's, which have the ability ot replicate autonomously. These contain RNA of low molecular weight and induce diseases in higher plants.