It is impossible to exactly define what intelligence would be in a molecule or complex molecular system. The Turing test is used to determine if a machine can match the intelligence of humans, but is inexact. Can we think of a version of a Turing test to consider if hepatitis D virus, the smallest human virus, is intelligent. For the details of hepatitis D virus' very complex lifestyle please refer to the previous post Smallest Human Virus – Very Dangerous, Very Intelligent