The correct answer is B, C, A, E, D (RNA processing → Transcription → mRNA leaves the nucleus → Ribosome assembly → Peptide bond formation).​​

This sequence reflects the eukaryotic central dogma, where transcription and RNA maturation precede translation in the cytosol, ensuring mature mRNA is ready for protein synthesis.

Option Analysis

C, B, A, E, D (Transcription → RNA processing → mRNA leaves → Ribosome assembly → Peptide bond)
Transcription must precede processing, as pre-mRNA is modified post-transcription; this reverses those steps. Incorrect.

A, B, C, E, D (mRNA leaves → RNA processing → Transcription → Ribosome assembly → Peptide bond)
mRNA export occurs after processing and transcription, not before; nuclear export of immature transcripts is blocked. Incorrect.

B, C, A, E, D (RNA processing → Transcription → mRNA leaves → Ribosome assembly → Peptide bond)
Processing (capping, splicing, polyadenylation) follows transcription in the nucleus, then export, followed by translation initiation (ribosome assembly) and elongation (peptide bonds). Correct.​

C, A, B, D, E (Transcription → mRNA leaves → RNA processing → Peptide bond → Ribosome assembly)
Export precedes processing here, which is impossible, and swaps translation steps. Incorrect.

The transcription and translation process in eukaryotes separates DNA-to-RNA synthesis in the nucleus from protein assembly in the cytosol, with key maturation steps ensuring fidelity.

Nuclear Events

RNA processing (B)—including 5′ capping, intron splicing, and 3′ poly-A tail addition—occurs co- or post-transcriptionally on pre-mRNA. Transcription (C) by RNA Pol II then produces the initial transcript from DNA template. Mature mRNA exits via nuclear pores (A) to the cytosol.

Cytosolic Translation

Ribosome assembly (E) involves small subunit binding mRNA’s 5′ cap and scanning to AUG, followed by large subunit joining. Peptide bond formation (D) occurs during elongation as tRNAs deliver amino acids and catalyze bonds via peptidyl transferase.​​