What are antibodies primarily composed of?

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

Answer: (B)

Verified step by step guidance

1. Understand that antibodies are a crucial part of the immune system, responsible for identifying and neutralizing foreign objects like bacteria and viruses.
2. Recognize that antibodies are also known as immunoglobulins, which are large, Y-shaped proteins.
3. Recall that proteins are composed of amino acids, which are the building blocks of antibodies.
4. Differentiate between the four main types of macromolecules in biology: proteins, lipids, nucleic acids, and carbohydrates.
5. Identify that among the given options, proteins are the macromolecules that form the structure of antibodies, as opposed to lipids, nucleic acids, or carbohydrates.