Believed to be true until the discovery retro viruses. dna-infected cells contain virally encoded reverse transcriptase, which uses a(n) rna template to synthesize dna. thus, their name contains the root retrovirus.

The correct answer will be -true

Explanation:

A virus cannot complete its life cycle without a host as they lack the machinery to replicate their DNA.   When some host cells in studies were detected with the virus-encoded reverse transcriptase, they termed the virus as the retrovirus.

The root retro was derived from the reverse transcriptase activity of the enzyme which acts by reversing the usual process of RNA synthesis from DNA as reverse transcriptase form DNA from RNA strand.

Thus, true is the correct answer.

the truman doctrine was an american foreign policy whose stated purpose was to counter soviet geopolitical expansion during the cold war. it was announced to congress by president harry s. truman on march 12, 1947, and further developed on july 12, 1948, when he pledged to contain threats to greece and turkey.

it would lead to upper respiratory infections and pneumonia.