Quick Answer. The RF output on many home entertainment devices is used to connect those devices to a television or other component using a coaxial cable. These outputs combine both audio and video signal into a single stream of information within the cable.
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For instance, let's take hemoglobin. It generally has 146 amino acids, but not all them are essential for the protein to be functional. So, if we a ask a question as to how many different amino acids are necessary for the protein to be known as the  hemoglobin  protein, then the answer depends on many things. Whenever changes in amino acid affects the physical structure of protein molecule, the affected protein becomes inactive.