What major type of RNA acts as a template during protein synthesis?

The major type of RNA that acts as a template during protein synthesis is messenger RNA (mRNA). During the process of transcription, mRNA is synthesized based on the DNA template, carrying the genetic information needed for protein synthesis. This mRNA is then translated by ribosomes into a specific sequence of amino acids, which ultimately folds into a functional protein.

In this context, mRNA serves as a crucial intermediary, linking the DNA's genetic code to the production of proteins, which are essential for cellular functions. This role is vital as the sequence of nucleotides in mRNA directly determines the sequence of amino acids in the synthesized protein, ensuring that the correct proteins are produced according to the genetic instructions.