Which of the Following Observations Supports the Notion That the Gene

Which of the following observations supports the notion that the gene is simply a set of DNA sequences that are transcribed into a single RNA molecule that encodes a single polypeptide?

A) Alternative splicing-a single gene can yield multiple mRNA and protein products.
B) A single ribosomal RNA transcript can liberate several RNA molecules via further processing.
C) RNAs can be the functional product of a gene without being translated into a protein product.
D) Within a protein coding region, each codon represents a specific amino acid that will be linked to form a polypeptide.
E) Regulatory elements are part of a gene that regulate timing, degree, and specificity of gene expression but are not transcribed.