Which of the following features are more like to be found in a non-functional pseudogene than in a functionally active gene?
a/ a terminal exon followed by signals for post-transcriptional processing
b/ exons that produce a complete open reading frame when spliced together
c/ a promoter with signals identical to the promoter of another gene
d/ only one exon with a stop codon
e/ introns missing the GT-AG splice junctions appropriate for this gene