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.

A late work from this movement done entirely in shades of brown is Mechano-Dancer, by Vilmos Huszar. A house from this movement, designed by the maker of the Red and Black Chair, was commission by Mrs. Schroder-Schrader. The best-known member of this group broke away over an argument about the use of diagonal lines with Theo von Doesburg. Also known as neoplasticism, for 10 points, Piet Mondrian was key figure in what Dutch artistic movement
Fine Arts

When it interacts with ryanodine receptors, this element upregulates its own release, and this compound forms the cell plates of coccolithophores. Stimulation of Gq ("g-sub-q") opens a channel that allows for this ion's movement, and proteins that bind this ion have an EF hand motif. Cellular concentrations of this ion are regulated by IP3. Parafollicular cells of the (*) thyroid produce a compound that reduces the concentration of this ion in blood, and its intestinal absorption requires vitamin D. This ion interacts with Troponin to stimulate muscle contraction, and the lumens of sarcoplasmic reticula have high concentrations of this ion. For 10 points, name this divalent cation that is stored in bones.
Science

structures resolve a problem first recognized by Alexei Olovnikov, although they are not necessary in most bacteriophages and bacteria. Their namesake enzyme was first discovered in Tetrahymena. That enzyme is a ribonucleoprotein which carries out reverse transcription to add several repeats of a six-nucleotide sequence, (*) TTAGGG. Hydrogen bonding between those guanine residues creates a hairpin structure, which enables the rest of the lagging strand to be filled in. Although they are extremely stable in most tumor cells, these structures gradually shorten as a normal somatic cell ages. For 10 points, name these segments of DNA which protect the ends of linear chromosomes from decay.

Science