How do hidden viruses differ from active viruses?

The instructions for making proteins come originally from

Organisms that successfully adapt will leave to grownone of the above

Dna, in the nucleus carries the genetic code for making proteins in ribosomes. in the diagram, b, represents the proteins produced. dna cannot leave the nucleus to carry the genetic information to the ribosome where proteins are produced. how does the genetic code get from the nucleus to the ribosome? what does a represent? now