What is the primary function of ribosomes?

• A. Cell division
• B. Energy production
• C. Protein synthesis
• D. DNA replication

Answer: (C)

Ribosomes play a critical role in protein synthesis, which is fundamental to cell function and biology. They are the molecular machines that translate messenger RNA (mRNA) into polypeptide chains, which then fold into functional proteins. This process, known as translation, occurs in two stages: initiation and elongation. During initiation, the ribosomal subunits bind to the mRNA and recognize the start codon, while in elongation, the ribosome moves along the mRNA, adding amino acids one by one according to the mRNA sequence.

The importance of ribosomes in protein synthesis cannot be overstated, as proteins are essential for numerous cellular activities, including structural roles, enzymatic functions, and signaling pathways. Thus, ribosomes are pivotal in the central dogma of molecular biology, bridging the genetic code contained in DNA and the vast array of proteins that carry out cellular functions. This function clearly aligns with the correct answer, highlighting the ribosome's role as the site of protein synthesis in both prokaryotic and eukaryotic cells.