According to the research, the correct option is R groups. All 20 amino acids have a similar chemical structure except for the R groups.
They are substances that are responsible for optimizing in the best possible way the storage of fundamental elements for the organism whose molecules are formed by a carboxyl group and an amino group.
In this sense, the carboxyl group joins the amino group through the same carbon (the alpha carbon) attaching a side chain whose structure varies (R groups) and a hydrogen, generating the different amino acids.
Therefore, we can conclude that according to the research, the correct option is R groups. All 20 amino acids have a similar chemical structure except for the R groups.
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