Where mitochondrial proteins are synthesized? and what's the role of post translational processing signals?

Ribosomes

Explanation:

No matter where mitochondrial proteins are made, they are synthesized on Ribosomes that translate messenger RNA into the amino acids that form the protein chain. Most of the proteins in mitochondria function in genome regulation, DNA maintenance, and upkeep of the small percentage of internal mitochondrial proteins.

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explanation:

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the relative atomic mass of an element is the mass of one atom of that element, relative to 1/12th of the mass of a  1212c atom. to convert to an absolute mass in kg, it is necessary to multiply by  1.661×10−271.661×10−27.

the relative atomic mass is roughly equal to the number of neutrons, plus the number of protons, in the nucleus of the atom.

for elements with more than one stable isotope (different types of nucleus with different numbers of neutrons but the same number of protons), the quoted mass is usually the average mass, weighted by the relative abundance of the different isotopes.