Asked by Ryann Goodsell on May 25, 2024
Verified
The gene that codes for the repressor protein of the E. coli lac operon is constitutive; therefore, the lac operon is typically:
A) turned off
B) turned on
C) unaffected by the repressor protein
D) constitutive
E) activated by the repressor protein
Constitutive
Expressed continuously under normal physiological conditions, not subject to regulation by environmental conditions.
Lac Operon
A set of genes involved in the metabolism of lactose in bacteria, along with their promoter and operator sequences that control their expression.
Repressor Protein
A type of protein that binds to specific DNA sequences and inhibits the expression of a gene by blocking RNA polymerase.
- Attain insight into the modulation of gene expression in prokaryotes, specifically through the operation of inducible and repressible operons.
- Comprehend the diverse components and arrangement of an operon.
Verified Answer
LP
Leywes PierreJun 01, 2024
Final Answer :
A
Explanation :
The gene that codes for the repressor protein of the E. coli lac operon is always expressed (constitutive), leading to the production of the repressor protein that binds to the operator site of the lac operon, turning it off in the absence of lactose.
Learning Objectives
- Attain insight into the modulation of gene expression in prokaryotes, specifically through the operation of inducible and repressible operons.
- Comprehend the diverse components and arrangement of an operon.