Indicate true (T) and false (F) statements below regarding mRNA splicing in human cells. Your answer would be a four-letter string composed of letters T and F only, e.g. TFFF.
( ) Introns must be removed in the order in which they occur along the pre-mRNA.
( ) Nucleosomes tend to be positioned over exons (on average, about one nucleosome per exon).
( ) Exon size tends to be much more variable than intron size.
( ) The exon junction complexes mark the sites on the mRNA where splicing has not been successful.