Which of these has a nucleus coma and tail

before it leaves the nucleus of a eukaryotic cell, mrna is altered in the following ways: - a cap is added to the 5' end of the mrna molecule; - a poly a tail is added to the 3' end; - introns are removed and exons are spliced together.

it has one origin of replication, but it proceeds in two directions - d)

i'd say that the moon rock is about 2.2 billion years old.

      n