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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
When lactose is present in the culture medium:
Distinguish between structural gene, regulatory gene and operator gene.
______ refers to the phenomenon by which a set of genes are switched on when there is necessity to metabolise a new substrate.
The image below shows the result of plating bacteria in a chromogenic medium after incorporating the gene of interest in the plasmid. Some plates had blue colonies; some plates had white colonies. A single bacterium extracted from Plate I, II, and III is shown below:
On the basis of your observations:
- Identify the plate(s) which is/are white. Give a reason.
- Identify the plate(s) which is/are blue. Give a reason.
List the changes that the primary transcript undergoes to become functional mRNA.
Which of the following best describes gene regulation?
Gene regulation can be described as switching genes ON or OFF according to which two factors?
Which level of gene regulation involves the movement of mRNA from the nucleus to the cytoplasm?
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 enzyme does Escherichia coli produce to break down lactose?
What are the two products formed when E. coli β-galactosidase breaks down lactose?
What term describes the process by which inducible enzymes are produced?
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?
