Pseudogenes are homologues of functional genes that lack promoters and are therefore part of the unexpressed DNA. It is thought that at least some of these pseudogenes were produced by reverse transcription of mRNA and insertion of the resultant cDNA into a chromosome by a virus. In addition to lacking a promoter and other regulatory elements, a pseudogene produced in this manner will also differ from the authentic gene in which one of the following ways?

1. A)It will lack intronsGABARITO
2. B)It will contain nested genes for antibiotic resistance
3. C)It will have lost some coding regions
4. D)It will contain an oncogenic mutation
5. E)It will require Shine-Dalgarno sequences