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.
Input: Some of these units possess an attenuator site which can control processes according to the amount of end-product found in the cell. If a represser molecule binds to one of its adjacent loci transcription is prevented, but if an inducer binds to the represser its promoter site can bind the RNA polymerase, initiating transcription of its structural genes. Proposed in the Jacob-Monod hypothesis and modeled after the lac version, FTP, what are these genetic units which control gene expression in bacteria.
Output:
Science