How many different amino acids are used in protein synthesis?

Environmental differences within ecosystems are generally caused by

What amino acid is coded for by this sequence after the mutation

You are working in the lab and are working with the same element but with varying isotopes of the element. you are working with c-11, c-13, c-14, and c-15. what is the average atomic mass of this element? (use periodic table) a- 12 b-15 c-14 d-13