Question

In organisms of any domain, genetic information is encoded in DNA and transcribed into RNA. This happens because:

1.organisms have both DNA and RNA, so transcription occurs instead of translation

2.organisms self-replicate, and they all do so in the same manner

3.organisms share a common ancestor, so they also all share core life processes

4.organisms use DNA to replicate, and they have RNA to store the genetic information

(please explain why, I need help studying for a exam)