the nucleus looks a little bit like this the nucleus contains DNA and is protected by a membrane. Prokaryote cells do not have a nucleus therefore not having a DNA. The DNA is loose around the cell. While Eukaryote cells have a nucleus.
The lamb will look like Harry because it has his genetic information (the nucleus taken from Harry) planted inside it. It will not look like Sally because her nucleus has been removed and so it no longer contains any genetic information to do with her.
A cell nucleus consists of a nuclear membrane that surrounds it, within the membrane there is a nucleolus which can be compared metaphorically to the yolk of an egg in appearance. The nucleolus is surrounded by nucleoplasm which is quite like the cytoplasm.