Discussion
Polycistronic transcription units are common in :
Answer: D
Polycistronic transcription units are common in both Archaea and Bacteria (spelt Archae in the paper).
Prokaryotes group genes into operons, transcribed from one promoter into a single mRNA that carries several coding sequences, each with its own ribosome-binding site. This is standard in bacteria (the lac operon) and equally common in archaea, whose genes are also organised into operons.
Eukaryotes generally transcribe each gene separately into a monocistronic mRNA, with rare exceptions such as trypanosomes and nematodes. So 'Eukarya' is wrong, and options naming only one prokaryotic domain are incomplete.
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