What is repression in biology?
repression, in metabolism, a control mechanism in which a protein molecule, called a repressor, prevents the synthesis of an enzyme by binding to—and thereby impeding the action of—the deoxyribonucleic acid that controls the process by which the enzyme is synthesized.
What is repression in DNA?
Gene repression is the switching off of individual genes whose products are needed to maintain the function of the cell such as the production of vital enzymes or cofactors. This is especially important if the products of such genes are not long-lived and deteriorate, or are metabolized.
What is an act of repression?
noun. the act of repressing; state of being repressed. Psychoanalysis. the rejection from consciousness of painful or disagreeable ideas, memories, feelings, or impulses.
How does the repression of transcription occur?
These complexes could repress transcription in two ways: either physically blocking the access of RNAP to the promoter or altering the topology of DNA in the vicinity of the promoter, thus impairing transcription initiation.
What is the difference between induction and repression?
Repression is a decrease in gene expression. Induction is an increase in gene expression due to the presence of an inducer. While our genes provide all the instructions for the proteins we make, our individual traits are influenced by the regulation of gene expression.
What is the difference between repression and inhibition?
Feedback inhibition is the mechanism in which the accumulated end product binds with the enzyme and inhibits the enzyme activity by binding with it. On the other hand, feedback repression is the mechanism in which the accumulated end product works as a repressor and inhibits the enzyme synthesis at the genetic level.
What is induction in microbiology?
The conversion of a lysogenic infection into a productive infection. Induction often is stimulated by damage to bacterial DNA and in the case of prophages that are integrated into the bacterial chromosome, induction also involves excision of the prophage from the chromosome.
What does repression mean in politics?
Political repression is the act of a state entity controlling a citizenry by force for political reasons, particularly for the purpose of restricting or preventing the citizenry’s ability to take part in the political life of a society, thereby reducing their standing among their fellow citizens.
How is transcription repressed in eukaryotes?
Like prokaryotic cells, eukaryotic cells also have mechanisms to prevent transcription. Transcriptional repressors can bind to promoter or enhancer regions and block transcription. Like the transcriptional activators, repressors respond to external stimuli to prevent the binding of activating transcription factors.
What is enzyme repression in biochemistry?
Enzyme Repression* – Enzyme repression is the mode by which the synthesis of an enzyme is prevented by repressor molecules. From: Annual Reports in Medicinal Chemistry, 1998.
What is the definition of repression in English?
Definition of repression. 1 a. : the action or process of repressing : the state of being repressed. repression of unpopular opinions.
What is repression in psychology according to Freud?
Psychological repression is a necessary defense mechanism. It shields us from experiencing distressing thoughts on a daily basis. However, Freud believed that problems would occur whenever repression developed under a person’s superego (the moral conscience part of ourselves) in our unconscious mind.
What are some examples of psychological repression?
A woman who nearly drowned as a very young toddler may develop a fear of swimming or water. She might have no idea where the phobia came from. A student might insult their teacher because they remind him of an abusive parent. He has no memory of the abuse. ‘Freudian slips’ are thought to be good examples of psychological repression.
How do repressers react to stress?
In a simple stress test, repressers reacted with a much greater rise than non-repressers.