What type of biomolecule are antibodies?

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

Answer: (C)

Antibodies are classified as proteins, which are a type of biomolecule made up of long chains of amino acids. They play a crucial role in the immune system by identifying and neutralizing pathogens such as bacteria and viruses. Each antibody has a unique structure that allows it to bind specifically to a particular antigen, which is a molecule or part of a pathogen that elicits an immune response.

The structure of antibodies includes regions that are highly variable, allowing for the diversity needed to recognize a wide range of antigens. This functional specificity arises from the unique sequences of amino acids in the variable regions of the antibody molecules. Moreover, antibodies can exist as different classes (e.g., IgG, IgA, IgM) that serve different functions in the immune response.

Understanding antibodies as proteins also highlights their dependence on protein synthesis mechanisms, including transcription of DNA into mRNA and translation into protein, thus illustrating their role within the broader context of biological systems.