The correct answer is d) amino acids.
Proteins are large biomolecules that play many critical roles in the body. They are made up of smaller units called amino acids, which are linked together by peptide bonds. A peptide bond forms between the amino group of one amino acid and the carboxyl group of another, releasing a molecule of water in a process known as dehydration synthesis.
Amino acids are like the building blocks of proteins, and there are 20 different amino acids that can combine in various sequences to create all the proteins necessary for life. Understanding the structure and function of proteins is crucial in fields like biochemistry and molecular biology.