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What is true for cyanobacteria?

1. Oxygenic with nitrogenase
2. Oxygenic without nitrogenase
3. Non-oxygenic with nitrogen
4. Non-oxygenic without nitrogenase

Correct answer: Oxygenic with nitrogenase

Solution

Cyanobacteria are photosynthetic bacteria that produce oxygen during photosynthesis, so they are oxygenic. Many of them also possess nitrogenase, the enzyme used to fix atmospheric nitrogen into usable forms.

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