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प्रश्न
Which of the following statements is correct about the role of regulatory proteins in transcription in prokaryotes?
विकल्प
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
______ refers to the phenomenon by which a set of genes are switched on when there is necessity to metabolise a new substrate.
Which of the following is not a level at which gene expression can be regulated in eukaryotes?
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.
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:
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 condition regulates gene expression in a cell?
Which process is responsible for development and differentiation from embryo to adult organism?
Which level of gene regulation involves the formation of the primary transcript in eukaryotes?
Which level of gene regulation specifically controls splicing 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 enzyme does Escherichia coli produce to break down lactose?
Is the production of inducible enzymes an example of positive or negative control?
What is feedback repression?
