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Flagella (singular = flagellum) are long, hair-like structures that extend from the plasma membrane and are used to move an entire cell, (for example, sperm, Euglena). When present, the cell has just one flagellum or a few flagella. Prokaryotes sometimes have flagella, but they are structurally very different from eukaryotic flagella.
20 cze 2023 · The lac operon is under both negative and positive control. The mechanisms for these will be considered separately. 1. In negative control, the lacZYA genes are switched off by repressor when the inducer is absent (signalling an absence of lactose).
Study Flashcards On Biology Chapter 1-3 Exam Review at Cram.com. Quickly memorize the terms, phrases and much more. Cram.com makes it easy to get the grade you want!
Introduction to gene regulation. Regulation is all about decision making. Gene regulation is, therefore, all about understanding how cells make decisions about which genes to turn on, turn off or to tune up or tune down.
