How do ribosomes synthesize proteins?

Ribosomes synthesize proteins through a process called translation, where the genetic information encoded in messenger RNA (mRNA) is used to assemble amino acids into a specific polypeptide chain.

The process begins when mRNA, transcribed from DNA, attaches to a ribosome in the cytoplasm or on the rough endoplasmic reticulum. The ribosome reads the mRNA sequence in sets of three nucleotides called codons, each of which specifies a particular amino acid.

Transfer RNA (tRNA) molecules carry amino acids to the ribosome. Each tRNA has an anticodon that pairs with the corresponding codon on the mRNA. This ensures that the correct amino acids are added in the proper sequence.

The ribosome facilitates the formation of peptide bonds between adjacent amino acids, elongating the polypeptide chain. This continues until a stop codon is reached, signaling the termination of protein synthesis.

After synthesis, the polypeptide folds into its functional three-dimensional structure and may undergo further modifications.

Overall, ribosomes act as the site of protein synthesis, translating genetic information into functional proteins essential for cellular structure and activity.