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 performs oxygenic photosynthesis as they use water molecules during photosynthesis to produce oxygen as its byproduct.

Cyanobacteria possess chlorophyll a, giving them their characteristic green colour.

Photosynthetic bacteria do not contain chlorophyll instead have beta-carotene, xanthophyll and phycobilins. It uses hydrogen sulphide during the process to release sulphur as the byproduct. So, photosynthesis in bacteria is non-oxygenic.

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