Which one of the following amino acid has crucial role in the variability of protein structure?

A. DNA primase B. Primase C. Primer synthase D. All of the above

A. RNA editing B. Antisense RNA C. RNA splicing D. All of the above

A. B-DNA B. A-DNA C. Z-DNA D. All of the above

A. 5' → 3' phosphodiester bonds B. H₂ bonds C. Phosphorylated ions D. Covalent bonds