A tourist presented to a primary care health clinic complaining of malaise, fever, and headache. She has subsequently been diagnosed with Rocky Mountain spotted fever, a pathology caused by Rickettsiaceae. Which of the followed statements best captures a characteristic trait of Rickettsiaceae?
They are eukaryotic.
They have both RNA and DNA.
They have a distinct spiral-shaped morphology.
They are neither gram-negative nor gram-positive.