Question

Protein is a polymer of _______.

• A. Amino acids
• B. Lipids
• C. Nucleic acids
• D. Carbohydrates

Answer 1

The Correct Option is A

Proteins are biological macromolecules that are essential for numerous functions in living organisms. These complex structures are polymers made up of repeating units called monomers. In the context of proteins, the monomers are: 

Amino acids. These are organic compounds characterized by the presence of an amino group (-NH2), a carboxyl group (-COOH), a hydrogen atom, and a distinctive side chain all bonded to a central carbon atom. Through peptide bonds, amino acids are linked together to form polypeptide chains, which fold into specific three-dimensional shapes to become functional proteins.

None of the other options (Lipids, Nucleic acids, or Carbohydrates) serve as the building blocks of proteins. Each of them is a different type of macromolecule serving unique functions within biological systems.

Answer 2

The correct answer is (1) Amino acids.

Proteins are polymers made up of amino acids. The building blocks of proteins are amino acids, which are linked together by peptide bonds to form long chains known as polypeptides. These polypeptides fold into specific three-dimensional structures, forming functional proteins.

Let’s review the other options:

(2) Lipids: Lipids are not polymers of amino acids; they are a diverse group of hydrophobic molecules that include fats, oils, and phospholipids.

(3) Nucleic acids: Nucleic acids (DNA and RNA) are polymers of nucleotides, not amino acids. Nucleotides are the building blocks of nucleic acids.

(4) Carbohydrates: Carbohydrates are polymers of monosaccharides, not amino acids. Examples include starch and cellulose.

Thus, the correct answer is (1) Amino acids, as proteins are made up of chains of amino acids.