What is the difference between transcription and translation

Transcription and translation are the two core stages of gene expression. In transcription, the enzyme RNA polymerase reads a DNA template strand and synthesizes a complementary mRNA molecule. In translation, ribosomal subunits bind to the mRNA, decode its codons, and join the appropriate amino acids into a protein.

Key Differences

Major distinctions between the processes

• Location: nucleus vs. cytoplasm
• Molecule produced: RNA vs. protein
• Enzymes involved: RNA polymerase vs. ribosome
• Template: DNA vs. mRNA

During transcription, a DNA segment such as 5'-ATG CCT GAA‑3' is read by RNA polymerase, which adds complementary ribonucleotides, yielding the mRNA strand 5'-AUG CCU GAA‑3'. This mRNA now carries the genetic code out of the nucleus. The process ends when a poly‑A tail is added and the transcript is released.

Translation Process

Steps a ribosome follows to make a protein

1. 1Initiation: small subunit binds the 5' cap, finds the start codon AUG
2. 2Elongation: tRNA anticodons pair with each codon, adding amino acids
3. 3Termination: a stop codon (UAA, UAG, UGA) triggers release of the polypeptide

Using the mRNA from the example, the ribosome reads the first codon AUG, which codes for methionine, then CCU for proline, and finally GAA for glutamic acid. The resulting tripeptide has the sequence Met‑Pro‑Glu. Each addition releases a molecule of pyrophosphate, providing the energy that drives chain growth.

Side‑by‑side comparison