| Sumario: | The interaction of biochemistry and genetics, some years ago, led to an understanding of the basis of the genetic code and protein biosynthesis. These findings lent a fresh perspective to different branches of biology, including those devoted to studying mechanisms of learning and memory. It has been claimed that in anything from five to twenty years, the molecular basis of memory could be unraveled, which entailed the assumption that individual and immunological memory is encoded through a mechanism similar to that of species memory, i.e. through a molecular code. Thus, a unitary hypothesis, including the three kinds of memories, was put forward. The unitary hypothesis of memory presents a series of characteristics that allows it to be considered a good hypothesis.
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