Cyanobacteria differ from bacteria as these:

Perform oxygenic photosynthesis

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Exhibit sexual reproduction

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Do not have membrane bound cell organelles

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Have circular double stranded DNA

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Solution

The correct option is A Perform oxygenic photosynthesis
Cyanobacteria use water molecules in the place of hydrogen sulphide in photosynthesis. Therefore, these produce oxygen in photosynthesis. Thus, they perform oxygenic photosynthesis.
Cyanobacteria possess chlorophyll-a, while bacteria do not contain chlorophyll. Chlorophyll gives them their characteristic blue-green color.

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