Lactose

Entity

Lactose

Disaccharide that, when it is the only carbon source, activates transcription of the lac operon.

It is a disaccharide made up of glucose and galactose.

It acts as an inducer of the lac operon in bacteria: its presence, in the absence of glucose, allows transcription of the genes needed for its own metabolism.

The video presents it as the signal that, when it is the only available carbon source, causes Escherichia coli to release repression of the lac operon; it also states that β-galactosidase breaks it down into glucose and galactose.

Relations

• Lactose → induces → Lac operon
  Evidence

  Sources · original ES transcript

  • The Rule Behind All Life | The Central Dogma12:06

    Cuando la única fuente de carbono es lactosa, la bacteria libera la represión del operón lac,

• β-galactosidase → breaks down → Lactose
  Evidence

  Sources · original ES transcript

  • The Rule Behind All Life | The Central Dogma12:17

    una enzima especializada en descomponer la lactosa en glucosa y galactosa.

Sources · original ES transcript

• The Rule Behind All Life | The Central Dogma12:06

  Cuando la única fuente de carbono es lactosa,

• The Rule Behind All Life | The Central Dogma12:17

  de β-galactosidasa, una enzima especializada en descomponer la lactosa en glucosa y galactosa.