Transcription vs Translation
How to tell Transcription and Translation apart when a board question makes them look alike.
Transcription: DNA to RNA by RNA polymerase in the nucleus; translation: mRNA to protein by ribosomes in the cytoplasm.
Side by side
Transcription synthesizes RNA from a DNA template using RNA polymerase, promoter recognition, ribonucleotides, and 5-prime to 3-prime RNA elongation.
Translation synthesizes protein from mRNA using ribosomes, tRNA anticodons, aminoacyl-tRNA synthetases, codons, and peptide bond formation.
RNA polymerase reads DNA template and creates pre-mRNA in eukaryotic nuclei or mRNA in prokaryotic cytoplasm.
Ribosomal RNA catalyzes peptide bond formation while tRNAs deliver amino acids according to mRNA codons.
Promoter, RNA polymerase, TATA box, sigma factor, capping, splicing, or polyadenylation supports transcription.
Ribosome, codon/anticodon, aminoacyl-tRNA, initiation factors, and peptide elongation support translation.
The trap
Both use nucleic acid sequence information, but polymerase/promoter clues are transcription and ribosome/tRNA clues are translation.
The repair move
For central-dogma questions, identify the template, product, and molecular machine.
Try a free question
CoreIn a eukaryotic cell nucleus, an enzyme reads a DNA template and produces pre-mRNA, which is then capped at the 5' end with 7-methylguanosine, polyadenylated at the 3' end, and spliced to remove introns. Which process and which enzyme are most likely involved in producing the initial pre-mRNA?
Show answer and explanation
Answer: A. Transcription by RNA polymerase II. Transcription is DNA-templated RNA synthesis in the nucleus. Eukaryotic RNA polymerase II makes pre-mRNA from protein-coding genes; pol I makes rRNA in the nucleolus; pol III makes tRNA and 5S rRNA. Post-transcriptional processing adds 5' cap, 3' poly-A tail, and removes introns by spliceosome.
Why the other choices are tempting
- B. Translation produces protein from mRNA at the ribosome, not RNA from DNA.
- C. DNA replication produces DNA from DNA, not RNA from DNA.
- D. DNA repair fills gaps in DNA, not RNA synthesis.
- E. Reverse transcription produces DNA from an RNA template, the opposite direction of transcription.
Flashcards
Tap a card to flip it.
What clue supports Transcription?
Choose Transcription when the stem gives this pattern: Transcription synthesizes RNA from a DNA template using RNA polymerase, promoter recognition, ribonucleotides, and 5-prime to 3-prime RNA elongation.
What clue supports Translation?
Choose Translation when the stem gives this contrasting pattern: Translation synthesizes protein from mRNA using ribosomes, tRNA anticodons, aminoacyl-tRNA synthetases, codons, and peptide bond formation.
Quick answers
What is the fastest way to tell Transcription from Translation?
Transcription: DNA to RNA by RNA polymerase in the nucleus; translation: mRNA to protein by ribosomes in the cytoplasm.
What is the key clue for Transcription?
Transcription synthesizes RNA from a DNA template using RNA polymerase, promoter recognition, ribonucleotides, and 5-prime to 3-prime RNA elongation.
What is the key clue for Translation?
Translation synthesizes protein from mRNA using ribosomes, tRNA anticodons, aminoacyl-tRNA synthetases, codons, and peptide bond formation.
What is the common trap with Transcription vs Translation?
Both use nucleic acid sequence information, but polymerase/promoter clues are transcription and ribosome/tRNA clues are translation.