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प्रश्न
Which of the following statements is correct about the role of regulatory proteins in transcription in prokaryotes?
पर्याय
They only increase expression
They only decrease expression
They interact with RNA polymerase but do not affect the expression
They can act both as activators and as repressors
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उत्तर
They can act both as activators and as repressors
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संबंधित प्रश्न
In E.coli, three enzymes β- galactosidase, permease and transacetylase are produced in the presence of lactose. Explain why the enzymes are not synthesized in the absence of lactose.
Distinguish between structural gene, regulatory gene and operator gene.
Which of the following is not a level at which gene expression can be regulated in eukaryotes?
Genes that are involved in turning on or off the transcription of a set of structural genes are called ______.
Name the enzyme that catalyses the synthesis of the primary transcript.
List the changes that the primary transcript undergoes to become functional mRNA.
Which of the following are the post-transcriptional events in an eukaryotic cell?
- Transport of pre-mRNA to cytoplasm prior to splicing.
- Removal of introns and joining of exons.
- Addition of methyl group at 5' end of hnRNA.
- Addition of adenine residues at 3' end of hnRNA.
- Base pairing of two complementary RNAs.
Choose the correct answer from the options given below:
Gene regulation can be described as switching genes ON or OFF according to which two factors?
Which condition regulates gene expression in a cell?
At how many levels can gene regulation occur in eukaryotes?
At which level of gene regulation is control exerted during protein synthesis in eukaryotes?
What is the primary mechanism of gene expression control in prokaryotes?
What are the two products formed when E. coli β-galactosidase breaks down lactose?
What is the molecule that triggers the synthesis of an inducible enzyme called?
Is the production of inducible enzymes an example of positive or negative control?
What is feedback repression?
Which type of control is exemplified by feedback repression?
