What structural feature makes the 20 common amino acids different from one another?.

The R-group (side chain) is what makes each amino acid unique. Each of the 20 amino acids has a different side chain structure.

The awnser is b i believe

The main role of dna in the  cell is the long-term storage of information. it is often compared to a blueprint, since it contains the instructions to construct other components of the  cell, such as  proteins  and rna molecules.the main function of rna is to carry information of amino acid sequence from the genes to where  proteins  are assembled on  ribosomes  in the  cytoplasm. mark brainliest, my work is good.