Question

why organism like bacteria are called prokaryotic?

Answer 1

because they are the old cells and in bacteria the nucleus is not developed

Answer 2

organisms are divided into two basic groups
1. prokaryotic
2. Eukaryotic

prokaryotic :- who's nucleus is not defined like bacteria, and many other microorganisms.

whereas

Eukaryotic :- those who have defined nucleus like animal cell, plants cells etc.