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Temperature tolerance of thermal blue-green algae is due to

1. cell wall structure
2. cell organisation
3. mitochondrial structure
4. nucleic acid configuration

Correct answer: nucleic acid configuration

Solution

Thermal blue-green algae (cyanobacteria) survive high temperatures because their nucleic acids are configured in a way that remains stable under heat. This stability helps preserve essential genetic functions when other structures would be more easily disrupted.

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