lac operon


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Lac op·er·on

(lahk),
a collection of adjacent bacterial genes responsible for the entry and metabolism of lactose; contains the genes coding for three enzymes and is flanked by a repressor and a promoter region to control expression.
Farlex Partner Medical Dictionary © Farlex 2012

lac operon

A sequence of genes found in many bacteria that codes for the enzymes needed to break down lactose to glucose and galactose so that the sugars can be utilized. Studies on the lac operon have been important in genetic research. The lactose repressor protein controls the transcription of the lac operon.
Collins Dictionary of Medicine © Robert M. Youngson 2004, 2005

lac operon

the genetic system of Escherichia coli that is required to metabolize lactose and on which the OPERON MODEL is based.
Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005
References in periodicals archive ?
Lactose being natural inducer of lac operon causes less metabolic load on host machinery.
The molecular mechanism for blue/white screening is based on genetic engineering of the lac operon in the Escherichia coli laboratory strain serving as a host cell, combined with a subunit complementation achieved with the cloning vector.
In 1988 molecular biologist John Cairns and his colleagues at the Harvard School of Public Health observed induced mutations of various elements of the lac operon changes in Escherichia coli bacteria.