Identify the correct statement:

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(C) Option $A$ is incorrect because tailing involves the addition of adenylate residues at the $3'$-end, not the $5'$-end.Option $B$ is incorrect beca

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The split-gene arrangements represent probably an ancient feature of the genome.

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(C) Option $A$ is incorrect because tailing involves the addition of adenylate residues at the $3'$-end, not the $5'$-end.Option $B$ is incorrect because the strand that does not code for anything is called the template strand (or antisense strand).Option $C$ is correct. Split-gene arrangements (presence of introns) are considered an ancient feature of the genome, reflecting the '$RNA$ world' hypothesis.Option $D$ is incorrect because the sigma factor ($\sigma$) is responsible for the initiation of transcription, while the rho factor ($\rho$) is responsible for termination in bacteria.

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