Question

A bacterium and amoeba are placed in different domains because

Answer 1

D a bacterial cell is more simple
bacterial cells lack a nucleus (prokaryotic) whereas an amoeba cell has one (eukaryotic)

Answer 2

The correct answer is D.
 The domain is the broadest category in the classification of living organisms. All the living organisms are placed in three domains, which are archaea, bacteria and eukaryotes. The prokaryotes are separated into two groups, that is archaea and bacterial based on the differences in their 16S rRNA genes. Amoeba is classified as an eukaryotes because, its cell is more developed than that of bacteria.