Draw one of the possible dipeptides that could be formed between serine and lysine. For the N-terminal amino acid, highlight the atoms of the carbonyl group. Add charges to ionizable groups that would be present at neutral pH. To highlight an atom, click on the yellow highlighter tool, then click on the specific atom. Do not highlight any bonds, only atoms.

"among the transition metal elements, manganese and zinc have a slight lowering of electronegativities. the reason behind this is that the nuclear charges of these elements are slightly weaker than the other transition metal elements due to the way their valence electrons are filled up. both manganese and zinc have their valence electrons filled up to the 4th shell with 1 pair of electrons (4s2) completely occupying it. although the electrons in the 3rd shell (3d) are yet to be paired since the outer most shell is filled up, the ability of the nucleus to attract electrons is lessened. hence,   the electronegativity (or the ability to attract electrons) is lessened."