Microscopic messenger

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Possible Answers: RNA.

Random information on the term “RNA”:

All living organisms are dependent on three types of very large molecules for essentially all of their biological functions. These molecules are DNA, RNA and proteins, and are classified as biological macromolecules.[1] Without DNA, RNA and proteins, all known forms of life could not exist. This is because each molecule plays an indispensable role in biology.[2] DNA is an informational macromolecule that encodes the complete set of instructions (the genome) that are required to assemble, maintain, and reproduce every living organism.[3] Proteins are responsible for catalyzing the myriad biochemical reactions that are required to provide food and energy for every organism, and to carry out all of the additional functions of any given organism, for example movement, neural function, vision, or photosynthesis.[4] RNA is multifunctional, but its primary responsibility is to make proteins, according to the instructions encoded within a cell’s DNA. The simple summary is that DNA makes RNA, and then RNA makes proteins.
Taken from Wikipedia