Question

Proteins are polymers of $\alpha$-amino acids which are joined to each other by:

• A. Covalent Bond
• B. Peptide Bond
• C. Glycosidic Bond
• D. Coordinate Bond

Hint:

Bond types in biomolecules: Proteins → Peptide bond Carbohydrates → Glycosidic bond Nucleic acids → Phosphodiester bond

Answer 1

The Correct Option is B

Proteins are large, complex molecules that play many critical roles in the body. They are made up of smaller units called amino acids. Let's explore how these amino acids are linked to form proteins:

1. Amino Acids: Amino acids are organic compounds that combine to form proteins. They contain an amino group (NH_2), a carboxyl group (COOH), and a side chain specific to each amino acid.
2. Polymerization of Amino Acids: Proteins are formed when these amino acids are linked together in a chain through a specific bond. This bond is crucial for the structure of proteins.
3. Type of Bond Between Amino Acids:
   • The correct answer is the Peptide Bond. A peptide bond is a covalent chemical bond formed between two amino acids. This bond occurs when the carboxyl group of one amino acid reacts with the amino group of another, releasing a molecule of water (H₂O). This reaction is called a condensation or dehydration synthesis reaction.
   • Covalent Bond: While peptide bonds are a type of covalent bond, this option is too broad. The specificity of the peptide bond is what defines its role in protein formation.
   • Glycosidic Bond: This bond is found in carbohydrates, linking monosaccharides. It is not involved in the formation of proteins.
   • Coordinate Bond: Also known as a dative covalent bond, it is formed when both electrons in the shared pair come from the same atom. This is not involved in linking amino acids in proteins.
4. Conclusion: The peptide bond is essential in linking α-amino acids together to form proteins. This bond is critical for the formation and functionality of proteins in biological systems.