Proteins serve a number of biological functions and are central to all living processes

(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). Further information about the use of Neurospora in genetics

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