operon(redirected from Operons)
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a segment of a chromosome comprising an operator gene and closely linked structural genes having related functions, the activity of the latter being controlled by the operator gene through its interaction with a regulator gene.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.
A genetic functional unit that controls production of a messenger RNA; it consists of an operator gene and two or more structural genes located in sequence in the cis position on one chromosome.
[L. operor, to work, act, + -on]
Farlex Partner Medical Dictionary © Farlex 2012
A unit of genetic material that functions in a coordinated manner by means of an operator, a promoter, and one or more structural genes that are transcribed together.
The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.
operonA row of consecutive genes on a chromosome that operates as a functional unit. The structural genes in the operon are preceded by two regulatory sites occupied by regulatory genes, the promoter and the operator. These are essential for the expression of the operon. The genes in an operon have related functions that occur sequentially. All the genes in the operon are turned on and off together. All are transcribed into one large segment of MESSENGER RNA.
Collins Dictionary of Medicine © Robert M. Youngson 2004, 2005
operona genetic unit comprising a set of structural genes that is coordinately expressed. see OPERON MODEL.
Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005
A genetic functional unit that controls production of a messenger RNA.
Medical Dictionary for the Dental Professions © Farlex 2012