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Microtubules absent in

1. mitochondria
2. centriole
3. flagella
4. spindle fibres

Correct answer: mitochondria

Solution

Microtubules are cytoskeletal elements made of tubulin and are found in structures like centrioles, flagella, and spindle fibres. Mitochondria are double-membraned organelles for respiration and do not contain microtubules as a structural component.

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