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(A) $Cyanobacteria$ are photosynthetic prokaryotes.They lack membrane-bound organelles such as a nucleus or chloroplasts.Instead,they contain speciali

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Prokaryotic cell,having chromatophore

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(A) $Cyanobacteria$ are photosynthetic prokaryotes.They lack membrane-bound organelles such as a nucleus or chloroplasts.Instead,they contain specialized pigment-containing structures called chromatophores,which are extensions of the plasma membrane that facilitate photosynthesis.Therefore,they are prokaryotic cells that possess chromatophores.

Column-$I$ (Group of bacteria)	Column-$II$ (Their shape)
$a.$ Coccus	$(i)$ Rod-shaped
$b.$ Bacillus	$(ii)$ Spherical
$c.$ Spirillum	$(iii)$ Spiral
$d.$ Vibrio	$(iv)$ Comma-shaped

Which of the following statements correctly describes $Cyanobacteria$?

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Match the following:
Column-$I$ (Group of bacteria) Column-$II$ (Their shape)
$a.$ Coccus $(i)$ Rod-shaped
$b.$ Bacillus $(ii)$ Spherical
$c.$ Spirillum $(iii)$ Spiral
$d.$ Vibrio $(iv)$ Comma-shaped

The smallest known bacteria is:

Which one of the following is a prokaryote?

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