Final answer:
All the statements provided about the human genome are true. The exons, representing about 1.5% of the human genome, are conserved between humans and other mammals, and introns occupy a larger portion of the genome than exons.
Step-by-step explanation:
To determine the veracity of the statements about the human genome, we need to consider what is known about genomic composition and conservation among mammals. The human genome is indeed complex, consisting of both coding and non-coding regions. It contains over 20,000 genes, both expressed sequences (exons) and intervening non-coding sequences (introns).
Statement (a) notes that more than 40% of the human genome is composed of mobile genetic elements. Indeed, a significant portion of the genome is made up of these elements, which include transposons and retrotransposons. Statement (b) is true as more of the human genome codes for intron sequences than for exon sequences; introns are generally longer than exons within a gene. Statement (c) is accurate because about 1.5% of the human genome codes for exons. Statement (d) indicates that exons are mainly what is conserved between the genomes of humans and other mammals. This is also true, as exons are the coding regions of genes and are more likely to be subject to evolutionary constraints than intron regions. Therefore, the answer is (e), none of the above, since none of the statements listed is false.