Question

1. how do proteins contribute to defense of an organism? proteins make amino acids that the cell uses to build its membrane proteins regulate our feedback mechanisms proteins make antibodies that fight off infection proteins build up muscles to aid in movement of organisms

Explanation:

Antibodies are proteins that play a crucial role in the immune - system's defense against infections. They recognize and bind to specific foreign substances (antigens) to neutralize them or mark them for destruction.

Answer:

proteins make antibodies that fight off infection