Answer :
Protein is made up of a sequence of an amino group, a carboxyl group, a hydrogen atom and a side chain bonded to the centralcarbon atom.
Answer:
Option A, Proteins
Explanation:
Proteins (Amino acids) consists of one alpha carbon with a valency of four, thus it needs to form four bonds to become a stable molecule.
Thus, protein bonds to the following-
a) A R - group which is nothing but a long molecular chain of carbon, hydrogen or oxygen
b) A carboxyl group
c) A hydrogen atom
and
d) An amino group.
Thus, option A is correct.