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1. Is thelacoperon a repressible or an inducible operon? What happens in the absence of lactose?...

1. Is thelacoperon a repressible or an inducible operon? What happens in the absence of lactose? What happens in the presence of lactose? Is the trp operon a repressible or an inducible operon? What happens in the absence of tryptophan? What happens in the presence of tryptophan?

Solutions

Expert Solution

Lactose Operon is an inducible type of Operon.

Under normal conditions, when glucose is present and lactose is absent, the Operon is bound by repressor at operator and this prevents RNA polymerase from transcribing the Operon. In this case Operon is in switched off condition.

But when lactose is present in the medium, it acts as inducer and binds to repressor thereby degrading it. This makes operator free of repressor and now RNA polymerase can transcribe the Operon. In this case, the operon is in switched on condition.

Tryptophan Operon is a repressible type of Operon.

In normal condition, when tryptophan is absent, then the coupon is in switched on condition.

But whenever tryptophan is present in the medium, then tryptophan binds to the tryptophan repressor thereby activating it and making it bind to operator. Now the Operon cannot transcribe. This makes the Operon in a switched off condition.

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gladiator answered 1 year ago
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