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Question:

Viroids differ from viruses in having?

RNA molecules without protein coat

DNA molecules with protein coat

DNA molecules without protein coat

RNA molecules with protein coat

Solution:

Virus is the microorganism that is made up of protein and has a protein coat as an outer covering. Viruses are of two types based on their genetic material: either DNA-containing or RNA-containing. Whereas a viroid is the smallest particle that contains RNA as its genetic material but does not contain protein as an outer covering. Thus, the correct answer is option A.