Question

The Canadian biotech company Nexia engineered trans·genic goats to secrete this material in their milk. (20[5])In (20[2])N. clavipes (20[2])(“EN CLAV-uh-pees”), concentrated (20[1])micelles (20[1])(“MY-sells”) of this material form a “dope” that elongates into a 3-10 (“three ten”) helical liquid crystal in a tapering duct, then is emitted out a spigot. (20[1])This block co-polymer of poly-alanine and alanine-glycine is used by Argyroneta (“ar-GEAR-on-eta”) to make diving bells. (20[1])The major ampullate type of this material has a (*) Young’s modulus that exceeds (10[1])a giga·pascal. (10[1])This (10[1])material forms stronger (10[1])fibers than fibroin (10[2])(“fye-BRO-in”) but is light enough to form draglines (10[1])during ballooning. (10[1])Orb weavers secrete (10[1])this (10[1])substance (10[2])out (10[2])their spinnerets. (10[2])For 10 points, name this elastic material that brown recluses and black widows (10[2])use (10[1])to spin (10[1])webs. (10[1])■END■ (10[2])

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