Operons are mostly present in case of prokaryotes but some operons are also present in eukaryotes. These operons shows the polycistronic mRNA. Jacob and Monod explained the concept of Lac operon in bacteria.
Operons contains large number of genes in a cluster. All the genes of the operon are transcribed as a single mRNA.
Eventually, in theory, black holes will evaporate through Hawking radiation. But it would take much longer than the entire age of the universe for most black holes we know about to significantly evaporate.
