Which molecules are distinctively different in bacteria and archaea?

The answer is RNA polymerases.

RNA polymerases are involved in the process of transcription, which reads the DNA and thanks to RNA polymerases, RNA is synthesized. Bacteria have a special type of RNA polymerases that made them distinctively different from Archaea. Bacterial RNA polymerase is a large molecule that also catalyzes mRNA and ncRNA synthesis.

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He used pea plants to study the patterns of heredity.