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Question
Which of the following statements is correct about the role of regulatory proteins in transcription in prokaryotes?
Options
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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Solution
They can act both as activators and as repressors
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RELATED QUESTIONS
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.
Identify the process described in the following paragraph.
Repressible regulation of gene is seen when the end product of a biosyntbetic pathway like amino acid, is provided in the medium. At this time, internal biosynthesis of amino acid stops. It is negative control so the metabolite (amino acid) turns off a set of genes involved in producing that metabolite.
Which of the following factors regulate gene expression?
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:
Which of the following best describes gene regulation?
Which condition regulates gene expression in a cell?
Which level of gene regulation involves the formation of the primary transcript in eukaryotes?
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 is the molecule that triggers the synthesis of an inducible enzyme called?
