Chemistry & Chemical Reactivity

10th Edition
John C. Kotz + 3 others
ISBN: 9781337399074



Chemistry & Chemical Reactivity

10th Edition
John C. Kotz + 3 others
ISBN: 9781337399074
Textbook Problem

Draw Lewis structures for the two dipeptides that contain both alanine and glycine.

Interpretation Introduction


The lewis structure of two dipeptide that contains both alanine and glycine has to be drawn.

Concept introduction: Amino acids condense to form peptide bonds releasing small water molecules. A peptide bond is the chemical bond which is formed between two molecules of amino acid when carboxyl group of one molecule reacts with the amino group of another molecule. A polypeptide containing n amino acids will have (n1) peptide bonds.

The side of a polypeptide chain having free carboxylic group is called C-terminal and the side having free amino group is called N-terminal end.


Glycine and alanine amino acids condense to form the dipeptide having one peptide bond. The sequence of amino acid in which they condense to give peptide chain is important. Changing the sequence of amino acid changes the polypeptide formed.

Glycine and alanine can combine in two different ways. Either glycine can be present at C-terminal or it may be present at N-terminal of the dipeptide chain thus giving two different dipeptides. After combining the amino acids complete the octet of each atom with the help of lone pair of electrons. The lone pair of electrons are those electrons which do not take part in bond formation in a molecule. The two dipepetides formed are,

(1) Glycine-alanine

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