(a) The light produced by fireflies is the result of a light-producing reaction between luciferin and ATP catalyzed by the enzyme luciferase. (b) The protein fibroin is the major structural component of spider webs. (c) Castor beans contain a highly toxic protein called ricin. (Part a, Gregory K. Scott/Photo Researchers; part b, A. Shay/ Animals Animals; part c, Gerald & Buff Corsi/Visuals Unlimited).
Was this article helpful?