Which of the following proteins serve as antibodies?

• A. Collagens
• B. Immunoglobulins
• C. Keratin
• D. Albumins

Answer: (B)

Verified step by step guidance

1. Understand the role of antibodies in the immune system: Antibodies are proteins that help identify and neutralize foreign objects like bacteria and viruses.
2. Identify the protein type that functions as antibodies: Antibodies are a specific type of protein known as immunoglobulins.
3. Differentiate between the given protein options: Collagens, Keratin, Albumins, and Immunoglobulins.
4. Recognize that collagens are structural proteins found in connective tissues, keratin is a structural protein in hair and nails, and albumins are transport proteins in the blood.
5. Conclude that immunoglobulins are the proteins that serve as antibodies, as they are specifically designed to bind to antigens and facilitate their removal from the body.