The stepwise movement of the ribosome along mRNA by a distance of one triplet codon is termed:

1. In protein synthesis the ribosome attaches to one end of the mRNA. 2. As each codon is read, the ribosome must advance along the mRNA. 3. It shifts by exactly one triplet codon at a time toward the other end. 4. This stepwise shifting movement is called translocation. 5. Trap (transcription): transcription is the synthesis of mRNA from DNA, a separate process. 6. Trap (replication): replication is the copying of DNA, not ribosome movement. 7. Trap (mutation): mutation is a sudden change in a gene, not a movement step. 8. Hence the ribosome's one-codon stepwise motion is correctly named translocation. _Source: Balbharati (Maharashtra Board) Class 10 Science & Technology Part 2, Ch 1 "Heredity and Evolution", p.11_