Final answer:
Yes, Ac and Ds elements contain the same 11 bp inverted repeats at each end, and this is true. The Ds element lacks its own transposase and relies on the Ac element for transposition. Upon insertion, they create direct repeats of the target DNA.
Step-by-step explanation:
The Ac and Ds elements in maize contain the same 11 bp inverted repeats at each end, which is a characteristic feature of transposable elements. This is true and indicates that these sequences can be recognized by transposase enzymes for the process of transposition. However, it's important to note that the Ds element requires the presence of an Ac element to provide transposase, as the Ds element itself lacks the gene for this enzyme. Additionally, when these elements insert into the genome, they cause the duplication of a short sequence of target DNA at the insertion site, resulting in direct repeats – often 8 bp in length – that flank the transposon on both sides in the host genome.