Genetic information stored in DNA is expressed in the form of proteins. Give an example of how any change in this process results in a changed protein, and therefore a changed organism.

Prokaryotic and eukaryotic cells are different in many ways other than the presence or absence of a nucleus. if both archaebacteria and eubacteria are prokaryotic cells, then why are archaebacteria more closely related to eukaryotic cells than they are to eubacteria?