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.

Lin and Shu proposed the density-wave theory to explain how the structure of these entities is sustained. The most accurate method for measuring the distances to distant ones uses a relation between their maximum rotational velocity and absolute magnitude, which is known as the Tully-Fisher method. They are generally blue because of their high content of old stars, and one type of them features arms that emanate from each end of a namesake structure. They have discs like the lenticular type, but contain much more angular momentum than the elliptical type. FTP name these galaxies, some of which are barred, including the Milky Way.
Science

Notably, one of these entities is absent in the Leishmania mexicana GPI8 protein, and abnormally low numbers of pericytes occur if one is missing from PDGF. Binding of 14-3-3 proteins to GABAB ["Gabba-sub-bee"] receptors does not occur when two arginines are mutated to alanine in one of these entities, which also binds to the COPI complex. They are usually C-terminal signals, and a common mammalian one consists of the amino acids lysine, aspartate, gluatamate, and leucine, or KDEL. hnRNP C proteins contain one of them that allows them to override nuclear export signals. For 10 points, name these signals important in directing proteins to the correct membranes, most often used to prevent a protein's export from the endoplasmic reticulum. 
Science

This person objected to a portrayal of him as Claude Lantier in the novel LOuevre, which caused him to break with Zola. Early works like 1867s The Abduction focus on haunting themes, but he soon took up Romanticism, as evidenced by Young Girl at the Piano - Overture to Tannhuser. This artist turned to Impressionism in the 1870s with a series of views of his home at Jas de Bouffan. His later paintings were so deliberate that Still Life with Apples and Still Life with Plate of Cherries that depict waxed fruit. For ten points, identify this French Post-Impressionist painter best known for a series of views of Mont St. Victoire.

Fine Arts