What is the function of ribosomes?

• A. Synthesize DNA
• B. Produce ATP
• C. Build proteins
• D. Break down toxins

Answer: (C)

Ribosomes are essential cellular structures that play a critical role in the process of protein synthesis. They are made up of ribosomal RNA (rRNA) and proteins, and they serve as the site where genetic information, encoded in messenger RNA (mRNA), is translated into amino acid sequences, ultimately forming proteins. This process occurs in two main stages: translation initiation and elongation.

In initiation, the ribosome assembles around the mRNA strand, and the process starts with the binding of transfer RNA (tRNA) molecules that carry specific amino acids. During elongation, the ribosomes facilitate the formation of peptide bonds between these amino acids as they are added to the growing polypeptide chain. This function of ribosomes is vital for cellular function and growth, as proteins are required for various biological processes including enzyme activity, structural integrity, and cellular signaling.

The other options represent different cellular functions that are performed by other organelles or molecular complexes. For example, DNA synthesis is carried out by DNA polymerases, ATP production occurs in the mitochondria via cellular respiration, and breaking down toxins is primarily the function of the liver cells and specific enzymes. Thus, the role of ribosomes is specifically to build proteins, underscoring their importance in