What is the most reasonable explanation for the observation that transposons in many multicellular genomes are more often found in nongenic sequences (i.e.,sequences that do not code for genes) such as centromeric heterochromatin rather than in genic sequences (i.e,. gene sequences)?
Select one:
a. The AT-rich nature of centromere and other nongenic sequences makes it easier for transposon insertion.
b. Insertion into nongenic DNA is less likely to do harm to the host and thus would not be selected against.
c. Reverse transcriptase promotes integration into nongenic DNA preferentially.
d. The transposons are "safe" from harm from the host when in nongenic regions.
e. Genic DNA is protected from transposon insertion by all the transcription factors bound to the region.