Some basic gene expression questions I need some help on. Thanks?

1. During Eukaryotic gene expression, what part of the DNA is EXPRESSED?
coding regions (exons).

2. What happens to the mRNA after it has been transcribed in a eukaryote?
mRNA is exported from the nucleus to the cytoplasm.

3. What molecule is involved in this process?
Amino acids to form proteins.

4. How are the lac operon and eukaryotic gene expression similar?
Translating the conding regions into amino acidsby having the basic elements of gene expression (promoter - terminator - mRNA - tRNA - rRNA)

* I am sure thought about the last question
hope that helps