Protists and bacteria are grouped into different domains because
A) protists eat bacteria
B) protists have a membrane-bounded nucleus, which bacterial cells lack
C) bacteria decompose protists
D) protists are photosynthetic
Answer: B is the correct option.
Protists and bacteria are grouped into different domains because protists have a membrane-bounded nucleus, which bacterial cells lack.
Protists show membrane bound nucleus in their cells. Bacteria cells lack true nucleus . Their nuclear material is generally found in free state, without any membrane. That particular structure is called nucleiod.