How are Alu elements unusual as retrotransposon?

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How are Alu elements unusual as retrotransposon?

Please I need to know this!

a.) Most retrotransposons are interspersed repetitive DNA; Alu elements are not.

b.) They do not include the coding sequence for reverse transcriptase, but move about the genome using the enzymes coded for by other retrotransposons.

c.) They "jump" from one location to another, without leaving a copy of themselves in the first location.

d.) They did not arise from infections by retroviruses; most retrotransposons did evolve from viruses.

e.) They are not transcribed back into DNA from RNA before they are inserted into a new area of the genome.
 
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