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.

[EX Q]: proteins bind one end of these structures and help inhibit a process called "catastrophe. " These structures can have persistence lengths of 3-4 mm, which is several orders of magnitude higher than the average cellular diameter. These structures can be severed by katanin. Drugs such as paclitaxel stabilize these structures and prevent their depolymerization, where colchicine prevents its dimeric subunits from coming together. Shortening of these structure at the kinetochore ends of the spindle apparatus helps chromosomes walk towards poles during mitosis and meiosis. For 10 points, identify these structures which are components of the cytoskeleton and which are made of tubulin proteins.
[EX A]: Science

[EX Q]: This person's early fusion work often featured guitarist John McLaughlin, who is the namesake of one   of this musician's songs. McLaughlin is featured, along with pianists Chick Corea and Herbie Hancock,  on this person's album In a Silent Way. This performer often worked with pianist and arranger   Gil Evans, and they featured the second movement of Joaquin Rodrigo's composition Concierto de  Aranjuez [ah-rahn-HWEZZ] on the album Sketches of Spain. Name this trumpeter who placed the  songs "Blue in Green", "So What", and "Freddie Freeloader" on his album Kind of Blue.
[EX A]: Fine Arts

[EX Q]: This element catalyzes the addition of alpha-bromo esters to ketones in the Reformatsky reaction. This element is coordinated by a water atom and three imidazole nitrogens in the active site of carbonic anhydrase, and transcription factor II B has a "ribbon motif" named for this element. A structure with folds called the (*) "gag knuckle" and "treble clef" uses cysteine and histidine residues to bind an ion of this metal, its namesake "finger" domain. Its most often used ore is its sulfide, the mineral sphalerite. With nickel, this metal is used in rechargeable batteries. For 10 points, name this metal, which with a thin copper coating comprises pennies.
[EX A]:
Science