A set of identical twins are together in an introductory biology class. The unit of study is DNA and its structure. The teacher describes the structure of DNA and its role in gene expression over the course of the lesson. Which components of the structure and expression of DNA would be identical for these particular twins that account for their similar appearance? Select ALL that apply. A) The timing of the DNA replication is identical for all cells in these students. B) The environmental influence of gene expression is identical for both students. C) The alleles that are carried on the chromosomes are identical for both students. D) All of the genes carried on the DNA are always expressed for both of these students. E) The order of the bases on the interior of the DNA molecule is identical.