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I wonder what is its function and if it can be the genetic material for a living organism. If not, why?

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Yes, double-stranded, helical RNA exists. It can occur naturally, a famous example would be Rotavirus, as well as synthetically in the lab.

Please note, however, that viruses strictly speaking do not qualify as a living organism.

References:

RNA double helix structure identified using synchrotron - McGill University

Double-stranded RNA viruses - Wikipedia

Rotavirus - Wikipedia

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