[Answer] What is the structure of Rickettsia?

Answer: obligate intracellular gram-negative rods
What is the structure of Rickettsia?
The rickettsiae are a diverse collection of obligately intracellularGram-negative bacteria found in ticks lice fleas mites chiggers andmammals. They include the genera Rickettsiae Ehrlichia Orientia and Coxiella. These zoonotic pathogenscause infections that disseminate in the blood to many organs.
Genome Structure The genome of Rickettsia prowazekii is 1 111 523 base pairs in length and contains 834 protein-coding genes. It contains no genes for anaerobic glycolysis as well as genes involved in the biosynthesis and regulation of biosynthesis of amino acids and nucleosides in free-living bacteria similar to mitochondrial genomes.
The structure of the typical rickettsia is very similar to that of Gram-negative bacteria. The typical envelope consists of three major layers: an innermost cytoplasmic membrane a thin electron dense rigid cell wall and an outer layer.
Rickettsia is a short rod pleomorphic Gram-negative measuring 600 nm x 300. They may appear singly in pairs in short-chain filamentous form or in coccus from containing both DNA and RNA. The cell wall contains peptidoglycan that contains muramic acid and diaminopimelic acid. They divide like bacteria.
Genome structure. The unfinished genome sequencing of Rickettsia rickettsii is made up of 1 257 7…

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