Question

What specimen has RNA but not DNA

Answer 1

Both nucleic acids have Adenine, Cytosine and Guanine. DNA has an exclusive Thymine while RNA has Uracil which DNA doesn't have.

Answer 2

Virus.

Step-by-step explanation:

DNA is present as genetic material in all the living organisms except some viruses. The RNA is present as genetic material in few viruses only. Some virus has the ability to convert RNA into DNA.

Some viruses contain RNA as their genetic material and no DNA is involved in their replication. These viruses has the enzyme RNA dependent RNA polymerase that forms the RNA from the RNA molecule. Example: Mononegavirales.

Thus, the answer is virus.