The acidity of a solution reflects the concentration of free hydrogen ions in the solution.

The sequence of amino acids that form the polypeptide chain.

 Divides the body into superior and inferior portions.

Guanine.

Provides a ridged framework to support the body and stores minerals.

Buffers resist abrupt and large changes in the pH of body fluids by releasing or binding ions.

Chest.

Identify the correct property. Combined number of protons and neutrons in an atom.

Functional protein.

Prevents water loss, entry of germs into the body and synthesizes vitamin D.