In this task you will be given a text passage from a trivia quiz. You should choose the category this question belongs to from these categories: History, Science, Social Science, Fine Arts, Literature. You can only choose one category, so if in doubt, please choose the closest match.

[Q]: One protein that binds to this protein also binds to proline-rich sequences in the membrane proteins Vasp and Mena, and another is knocked out in the singed mutant. Phosphatidyl-inositol-4,5-bisphosphate regulates the binding of vinculin to both talin and this other protein, whose function is performed by nematode Major Sperm Protein in the only (*) eukaryotic cells known to lack one form of it. In addition to the aforementioned profilin and facsin, severin and gelsolin bind to this protein and sever it. Two toxins often used to study it are cytochalasins and phalloidin. Thymosin 4 sequesters this protein, which undergoes treadmilling because the critical concentration at its (+) and (-) ends is not the same. This protein consists of G monomers which polymerize into F filaments, which make up the microfilaments of the cytoskeleton. For 10 points, name this protein that forms cross-bridges with myosin in muscle cells.
[A]: Science


[Q]: This work cites Proudhon's Philosophy of Poverty as an example of a form of a philosophy to which it claims economists, philanthropists, and humanitarians belong. Its second section advocates a ten-point program which calls for the establishment of industrial armies as well as free education for all children in public schools. That section follows one which examines the history of the (*) bourgeoisie and the proletarians and claims that the history of society is a history of class warfare. For ten points, name this work authored by Friedrich Engels and Karl Marx, which discusses how the problems of capitalism would be solved by adopting socialism and eventually the title ideology.
[A]: Social Science


[Q]: He wrote about Johnny Hake, who quits his job producing the plastic wrap parablendum before finding Grace Maitland with the lawn boy while trying to commit a robbery in "The Housebreaker of Shady Hill. " In another novel by this author, Shinglehouse throws himself under a train and the boy Tony refuses to get out of bed, leading to his parents having Swami Rutuola visit to have Tony repeat "Hope" and "Love. " That novel, in which Paul Hammer tries to kill Eliot Nailles, is Bullet Park, and he wrote about Jody, the gay lover of the convict and heroin addict Ezekiel Farragut, who is accused of killing his brother Eben. This author wrote about St. Botolphs, which is home to Cousin Honora, who controlled the family nominally held by Leander. For 10 points, name this author of Falconer and The Wapshot Chronicle.
[A]:
Literature