Final answer:
Class I Retroelements do encode for transposase required for their transposition.
Step-by-step explanation:
True. Class I Retroelements, also known as retrotransposons, do encode for a transposase protein that is required for their transposition. Retrotransposons, like retroviruses, move by reversing the normal flow of information, transcribing RNA and then reverse transcribing it back into DNA before integrating it into a different location within the genome. They can be autonomous and have all the necessary genes for transposition or non-autonomous, relying on the activity of autonomous transposons.