instruction:
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.
question:
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.
answer:
Science

question:
The central character, a resident of the San Bernadino Arms, falls in with such characters as Harry, a purveyor of homemade silver polish, and Miguel, a Mexican breeder of fighting cocks. There's also Abe Kusich, a dwarf horse player, and Earle Stroop, an unsuccessful cowboy actor. This novel famously ends with a riot at the Persian Palace during which Homer Simpson likely dies and the protagonist Tod Hackett, barely escapes. FTP, name this short novel by Nathaniel West.
answer:
Literature

question:
One character in this novel meets his love interest through the feminist Kukshina. That character's love interest kisses him on the head before he dies of typhus contracted during an autopsy. One character is invited to Kolyazin's ball and another meets Sitnikov, who arrives uninvited at Anna Odintsov's. In this novel, Pavel is shot in the leg in a duel while his father Nikolai marries Fenitchka, and his brother marries Katya Odintsov. Centering on Arkady Kirsanov and the nihilist Bazarov, for 10 points, name this novel by Ivan Turgenev.
answer:
Literature