Question

Which statement is TRUE?

a) The transposition of Tn10 (bacteria), as well as Ac/Ds elements (maize) occurs if the donor DNA is fully methylated (state of DNA prior to replication).
b) The transposition of Tn10 (bacteria), as well as Ac/Ds elements (maize) occurs if the donor DNA is single-stranded.
c) The transposition of Tn10 (bacteria), as well as Ac/Ds elements (maize) occurs if the donor DNA is present in heterochromatin.
d) The transposition of Tn10 (bacteria), as well as Ac/Ds elements (maize) occurs if the donor DNA is hemimethylated (state of DNA after replication).

Answer 1

The transposition of Tn10 (bacteria), as well as Ac/Ds elements (maize), occurs if the donor DNA is hemimethylated (state of DNA after replication).

Step-by-step explanation:

The correct statement is d) The transposition of Tn10 (bacteria), as well as Ac/Ds elements (maize) occurs if the donor DNA is hemimethylated (state of DNA after replication).

The transposition of Tn10 and Ac/Ds elements occurs when the donor DNA is in a state of hemimethylation, which is the state of DNA after replication. Hemimethylation refers to the methylation of only one of the DNA strands. The hemimethylated state is important for transposition because it allows the transposase enzyme to recognize and target the transposon for movement.

This statement is supported by the fact that the Ac element, which carries the transposase gene, is able to mobilize the Ds element. The Ds element itself does not have the transposase gene and therefore relies on the Ac element for transposition.