RNA molecules without protein coat
DNA molecules with protein coat
DNA molecules without protein coat
RNA molecules with protein coat
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.