Most antigens are
A) large and complex molecules
B) polysaccharides
C) are proteins with molecular weights less than 10,000 Da
D) proteins that bind to a specific antigenic determinant

Question

Quizplus · Accepted Answer

Most antigens are large and complex molecules that the immune system recognizes as foreign and potentially harmful. Examples include proteins, carbohydrates, lipids, and nucleic acids.

Answer: D
 Antigens can be proteins, carbohydrates, lipids, or nucleic acids, but they all possess specific regions called antigenic determinants or epitopes. These regions are recognized by immune cells, which then mount an immune response to eliminate the foreign substance.

Most Antigens Are