What is the primary function of ribosomes?

The correct answer is Protein synthesis.

Explanation:
Ribosomes are essential cellular structures (macromolecular machines) found within all living cells. Their primary function is to translate genetic information encoded in messenger RNA (mRNA) into specific chains of amino acids, which then fold into functional proteins. This biological process is known as protein synthesis or translation.

Let's briefly review why the other options are incorrect:

• Energy production: This is primarily the function of the mitochondria (often referred to as the powerhouse of the cell) in eukaryotic cells.
• Lipid storage: Lipids are synthesized and stored by structures such as the smooth endoplasmic reticulum and specialized lipid droplets.
• DNA repair: DNA replication and repair mechanisms take place mainly within the cell nucleus (in eukaryotes) carried out by specific enzyme complexes like DNA polymerases and ligases.