TASK DEFINITION: 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.
PROBLEM: 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. 

SOLUTION: Science

PROBLEM: An RNA polymerase from one of these organisms is commonly used in in vitro transcription experiments, and one well-studied example of these organisms uses the Q antiterminator to transcribe its structural components. Benzer's rII system uses these organisms for single-nucleotide mutation mapping, and the Phi-X-174 example of these organisms was the first to have its genome (*) sequenced. These organisms carry genetic information between cells in transduction. These organisms were labeled with 32P and 35S in the experiment that showed that DNA is the substance that stores genetic information, performed by Hersey and Chase. These organisms use their tail proteins as an injection mechanism. For 10 points, name these viruses that infect bacteria.

SOLUTION: Science

PROBLEM: 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.

SOLUTION:
Science