A carbon skeleton is covalently bonded to both an amino group and a carboxyl group. When placed in water, it would function as both an acid and a base.
It describes the pattern in which carbon atoms in a molecule are bound together, ignoring the presence of other elements and the distinction between single and multiple bonds.
Life would not be possible without carbon skeletons because of their unique ability to create huge, diverse, and stable molecules.
Thus, the correct option is (D) would function as both an acid and a base.
Learn more about carbon skeleton, here:
https://brainly.com/question/3707087