Multiple Choice
When this is present in the cell, it binds to the repressor and the repressor can no longer bind to the operator:
16. Regulation of Expression
Prokaryotic Gene Regulation via Operons
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Both repressible and inducible operons control gene expression at the level of __________.
A
DNA packing
B
post-transcriptional processing
C
translation
D
post-translational processing
E
transcription
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Understand the concept of operons: Operons are clusters of genes regulated together, typically found in prokaryotes. They consist of structural genes, a promoter, and an operator. The regulation of these genes is crucial for efficient cellular function.
Differentiate between repressible and inducible operons: Repressible operons are typically active and can be turned off when a specific molecule is present. Inducible operons are usually inactive and can be turned on in the presence of a specific molecule.
Identify the level of gene expression control: Gene expression can be regulated at various stages, including transcription, translation, and post-translational processing. Operons primarily control gene expression at the transcription level.
Explore transcription regulation: Transcription is the process of copying a segment of DNA into RNA. Operons regulate whether transcription occurs, thus controlling the production of mRNA and subsequently the synthesis of proteins.
Conclude the role of operons: Both repressible and inducible operons control gene expression by influencing the transcription process, determining whether the genes within the operon are transcribed into mRNA.
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