question: Why are the presence of certain enymzes a tell tale sign of a virus ?
answer: humans can make neither RNA replicases nor reverse transcriptase
turker_answer: Because humans can make neither RNA replicases nor reverse transcriptase , their presence is a tell-tale sign of a virus .
rule-based: The presence of certain enymzes a are tell tale sign of a virus because humans can make neither RNA replicases nor reverse transcriptase .