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Question

What characteristic is shared by both bacteria and cyanobacteria?

This question was previously asked in
RRB Group D 2025 Question Paper (18-Aug-2026) (Shift 1)
The correct answer is

Both are single-celled prokaryotes

Bacteria and cyanobacteria (blue-green algae) both belong to the kingdom Monera. Their cells lack a true membrane-bound nucleus; the genetic material lies free in the cytoplasm as a nucleoid. They also lack membrane-bound organelles such as mitochondria and plastids, and each individual organism is essentially a single cell. That combination of features defines a prokaryote.

They do not possess a well defined nucleus, so the nucleus statement is wrong. Only certain bacteria live in ruminant guts; cyanobacteria live in water and moist habitats, so a gut habitat is not a shared trait. Neither group reproduces by seeds; seeds are a feature of higher plants. What both groups genuinely share is being unicellular prokaryotes.

Hence, the answer is Both are single-celled prokaryotes.

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