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.

This organelle's lamina helps support its shape. Some protists have both a macro and micro version of this organelle. One part of this organelle is the location of ribosome synthesis, while importins and exportins assist in transport in and out of this organelle. This organelle, whose envelope is continuous with the rough endoplasmic reticulum, has pores in its double membrane. Transcription occurs within this organelle, which disappears during mitosis as its chromatin assemble into chromosomes. For 10 points, name the control center of the cell.
Science

The losers standard-bearer, Sir Percival Thirwall, did not let the banner fall, even though both of his legs had been cut off. Some historians believe that the battle was fought closer to the villages of Dadlington and Stoke Golding. One of the more important casualties was Thomas Howard, 1st Duke of Norfolk, while real command on the winners side rested with John de Vere, 13th Earl of Oxford. Though the battle began well for the loser, the tide turned when Sir William Stanley led his troops into the fray on the side of the winner. FTP identify this battle that saw the end of the house of York when Henry Tudors forces defeated Richard III.
History

A more advanced form of this quantity is symbolized J and is called the density of this. In one case that density is equal to the permittivity of free space times the time derivative of the electric field. That case was introduced by Maxwell and is called the displacement of this quantity. One law states that its sum about at a junction is zero. It is measured by an (*) ammeter (AM-ee-ter) and is equal to voltage divided by resistance according to Ohm's Law. This quantity is measured in amperes. For 10 points, name this rate of charge, which can be viewed as direct or alternating.

Science