What is the significance of the fact that Rickettsia species

What is the significance of the fact that Rickettsia species cannot use glucose as a nutrient?

A-They do not synthesize ATP very efficiently and thus do not grow very quickly

B-They cannot make use of glucose in the human body; as a result, they do not cause human diseases.        

C-They cannot synthesize carbohydrate-containing structures such as the cell wall

D-They must live inside cells, where they have access to nutrients produced by those cells

Solution

In the living cell the Rickettsiae species uses adenosine triphosphate, amino acids, and nucleotides for their growth, so they does not uses glucose as energy source.

Therefore the answer is (D) They must live inside cells, where they have access to nutrients produced by those cells