Biology Middle School

A mutation that inactivates the regulatory gene of a repressible operon in an E. coli
cell would result in
a. continuous transcription of the structural gene controlled by that regulator.
b. complete inhibition of transcription of the structural gene controlled by that
regulator
c. irreversible binding of the repressor to the operator.
d. inactivation of RNA polymerase by alteration of its active site.
e. continuous translation of the mRNA because of alteration of its structure.
Question

Answers

Answer 1

Final answer:

A mutation inactivating the regulatory gene of a repressible operon leads to uninterrupted transcription of the regulated structural genes, due to the repressor protein no longer being able to inhibit RNA polymerase.

Explanation:

A mutation that inactivates the regulatory gene of a repressible operon in an E. coli cell would result in continuous transcription of the structural gene controlled by that regulator. This is because the repressor protein, which is coded by the regulatory gene, can no longer bind to the operator. This unbound state leaves the RNA polymerase able to bind to the promoter freely and thus transcribe the structural genes without interruption.

Related Questions

Dyhybrid crosses are crossed between two parents with two different heterozygous genes true or false

Answers

Answer:

The statement is False.

Explanation:

Dihybrid cross is a type of cross that occur between two different genes which differ in their traits.The cross between homozygous dominant and homozygoys recessive traits results in 1:0:0:0 phenotypic ratio. The resulting offspring will have dominant phenotype but will have carriers of recessive phenotype.
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