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Definition. 1  Lipoproteins are the packages in which cholesterol and triglycerides travel throughout the body. Measuring the amount of cholesterol carried by each type of lipoprotein helps determine a person's risk for cardiovascular disease (disease that affects the heart and blood vessels, also called CVD).
The trp Operon - a repressible system. The trp operon of E. coli controls the biosynthesis of tryptophan in the cell from the initial precursor chorismic acid. This operon contains genes for the production of five proteins which are used to produce three enzymes. The products of the E and D genes form a multimeric protein comprised of two copies of each protein to produce the enzyme anthranilate synthetase.