What are Antibodies

Antibodies are crucial proteins in the immune system, acting as warriors against harmful invaders called antigens. They circulate in the bloodstream, identifying and neutralizing antigens like viruses, bacteria, and allergens. Structurally, antibodies are Y-shaped proteins with specific binding sites that match antigens, similar to a lock and key. This specificity allows them to neutralize antigens or tag them for attack by other immune components. The immune system's diversity of antibodies enables it to recognize a wide range of antigens. There are five immunoglobulin isotopes in mammals, each directing specific immune responses. Antibodies can also be cloned in labs for research and medical use.

What is the primary role of antibodies in the immune system?

• To destroy healthy cells

• To produce antigens

• To fight off invading particles

• To create new cells

What are antigens?

• Molecules that destroy antibodies

• Cells that produce antibodies

• Foreign substances that trigger an immune response

• Proteins that help the immune system

How are antibodies structured?

• As a linear chain of amino acids

• As a circular protein with no chains

• As a Y-shaped protein with four polypeptides

• As a single polypeptide chain

What mechanism do antibodies use to bind to antigens?

• Random attachment

• Lock-and-key mechanism

• Magnetic attraction

• Chemical bonding

What is one function of antibodies in the immune response?

• To create new antigens

• To neutralize antigens

• To destroy all cells

• To produce toxins