What is one of RNA's primary functions?

RNA's primary function as an intermediary between DNA and protein synthesis is crucial for cellular biology. The process begins with DNA, which contains the genetic blueprint for an organism. However, DNA itself cannot be directly used to synthesize proteins. This is where RNA comes into play.

When a gene is expressed, RNA is transcribed from the DNA template. This messenger RNA (mRNA) carries the genetic information from the nucleus to the ribosomes, where proteins are synthesized. The ribosomes read the sequence of the mRNA, which is then translated into a specific sequence of amino acids, ultimately forming proteins. Thus, RNA acts as a vital link that facilitates the transfer of genetic information needed to produce proteins, which are essential for carrying out various functions within the cell.

In the context of the other options, DNA primarily stores genetic information, not RNA. Lipid creation is primarily the function of specific enzymes and metabolic pathways, rather than RNA itself. Regulation of metabolism involves various enzymes and signaling molecules, where RNA plays a supportive role but isn't the primary regulator. Therefore, the correct answer emphasizes RNA's key role as an intermediary in the process of protein synthesis.