Exceptions to the Central Dogma of Molecular Biology"" What is biggest revolution? Violation of Central dogma--- How &Why?

reverse transcription  

Explanation:

The central dogma of molecular biology states that the flow of the genetic information is unidirectional: DNA to RNA to protein. Thus, the central dogma indicates that a gene is always transcribed into a messenger RNA (mRNA) molecule, and then this mRNA is used as a template for protein synthesis during translation. Reverse transcription is an event that contradicts the central dogma since in this case there are enzymes known as reverse transcriptases that are capable of synthesizing DNA by using RNA as template. In eukaryotic cells, reverse transcription may occur naturally during the insertion of certain Transposable Elements (retrotransposons).

answer; the tunica intima also called tunica interna, consists of elastic fibers,connective tissue and smooth muscle cells;