LAC repressor bound to DNA. Computer model showing the molecular structure of a LAC (lactose) repressor molecule (purple and blue) interacting with ba

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LAC repressor bound to DNA. Computer model showing the molecular structure of a LAC (lactose) repressor molecule (purple and blue) interacting with bacterial DNA (deoxyribonucleic acid, green and pink). The LAC repressor inhibits the expression of genes that code for an enzyme which metabolizes lactose in bacteria. It is only present when lactose levels are low. This ensures that the bacteria only produce machinery used for the uptake and breakdown of lactose, when lactose is actually present.

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Size: 4850px × 3638px
Photo credit: © LAGUNA DESIGN/SCIENCE PHOTO LIBRARY / Alamy / Afripics
License: Licensed
Model Released: No

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