Bacterial DNA is

Straight

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Helical

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Membrane bound

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Circular and free

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Solution

The correct option is D Circular and free
Bacteria is a prokaryotic unicellular organism. It lacks membrane-bound organelles like mitochondria, golgi apparatus. It lacks true nucleus. In this, the genetic material is not bound by nuclear membrane. Hence, it is called as nucleoid. In this, the genetic material is free, double stranded circular DNA.
Thus, the correct answer is 'Circular and free.'

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