Detailed Instructions: 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.
Q: Cell bodies in which this substance has not yet been synthesized are called etioplasts. The synthesis of this substance is stimulated by cytokinin and can be inhibited by iron deficiency. Its catabolism is accompanied by an increase in pheophytin a and results in its conversion into a set of tetrapyrrole compounds. This porphyrin contains a central (*) magnesium ion, and its "E" type is found only in two species of golden algae. It is located in structures that are arranged in grana, thylakoids, where it is arranged with protein complexes called photosystems. For 10 points, name this green plant pigment that helps capture light energy.
A:
Science