Q.1
Given below are two statements, one is labelled as Assertion (A) and other one labelled as Reason (R).
Assertion (A) : Coxiella burnetii grows on embryonated eggs and not on blood agar.
Reason (R) : Coxiella burnetii is a an "energy parasite"
In light of the above statements, choose the most appropriate answer from the options given below
- Evaluation of Assertion and Reason:
- Assertion (A): Coxiella burnetii grows on embryonated eggs and not on blood agar.
- True. C. burnetii is an obligate intracellular bacterium that cannot replicate on standard cell-free enriched bacteriological agars like blood agar; it is routinely cultivated in living host cell cultures or the yolk sac of 5–7-day-old embryonated chicken eggs.
- Reason (R): Coxiella burnetii is an "energy parasite".
- False. Chlamydia species are the classic "energy parasites" because they lack genes for ATP generation and must import host ATP via an ATP/ADP translocase. In contrast, genome sequencing has demonstrated that C. burnetii encodes a complete TCA cycle and functional respiratory chain, synthesizing its own ATP.
- nalysis:
- ((A) is correct but (R) is not correct): Correct.
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