Which of the following is not a function of proteins?

Proteins play a vital role in many biological functions, but they do not store genetic information. This function is primarily held by nucleic acids, specifically DNA and RNA. These molecules encode genetic information, allowing for the storage and transmission of hereditary information from one generation to the next.

On the other hand, proteins can serve various crucial functions in the cell. They catalyze reactions as enzymes, providing the necessary speed for biochemical processes. Proteins also provide structure to cells and tissues, forming components like collagen in connective tissues or keratin in hair and nails. Additionally, proteins are involved in the transport of molecules across cellular membranes or within the bloodstream, exemplified by hemoglobin transporting oxygen in red blood cells.

Therefore, the statement that proteins store genetic information is incorrect, as that role is exclusively designated to DNA and RNA.