What is the primary function of ribosomes in a cell?

• A. To store genetic information
• B. To synthesize proteins
• C. To produce DNA
• D. To transport chemicals

Answer: (B)

Ribosomes play a crucial role in cellular biology as they are the sites of protein synthesis. They are complex molecular machines made up of ribosomal RNA (rRNA) and proteins, and they facilitate the translation process where messenger RNA (mRNA) is decoded to create polypeptide chains, which then fold into functional proteins. This function is vital for various cellular processes, as proteins are essential for the structure and function of cells, including enzymes that catalyze biochemical reactions, signaling molecules, and structural components.

The other options represent functions that are not attributed to ribosomes. Storing genetic information is primarily the role of DNA; producing DNA is carried out during DNA replication, involving different molecular machinery; and transporting chemicals is typically the responsibility of membrane-bound vesicles or other cellular structures, not ribosomes. Thus, the primary and defining function of ribosomes is indeed to synthesize proteins.