| 单词 | repressor |
| 例句 | In 1957, Pardee, Monod, and Jacob discovered that the lactose operon was controlled by a single master switch—a protein eventually called the repressor. The Gene 2016-06-02T00:00:00Z When there is no lactose present, a protein known as a repressor binds to the operator and prevents RNA polymerase from binding to the promoter, except in rare cases. Concepts of Biology 2013-04-25T00:00:00Z However, if the repressor is inactivated, RNA polymerase binds to the promoter, and transcription of the structural genes occurs. Biology for AP Courses 2022-06-09T00:00:00Z When the products of a gene are not needed, a repressor binds to the operator and prevents transcription from taking place. Miller & Levine Biology 2018-01-01T00:00:00Z But Mr. Etchecolatz surrendered few secrets during a series of trials over the decades as crowds jeered him as a “killer” and “repressor,” once throwing red paint at him in 2006. Miguel Etchecolatz, enforcer of Argentina’s ‘Dirty War,’ dies at 93 2022-07-05T04:00:00Z And that means that people are all of a sudden seeing, in very vivid detail, what repressors can accomplish with disinformation campaigns. Russia Is Using ‘Digital Repression’ to Suppress Dissent 2022-03-15T04:00:00Z When lactose is present, an end product of lactose metabolism binds to the repressor protein and prevents it from binding to the operator. Concepts of Biology 2013-04-25T00:00:00Z In prokaryotic cells, there are three types of regulatory molecules that can affect the expression of operons: repressors, activators, and inducers. Biology for AP Courses 2022-06-09T00:00:00Z When the products of the gene are needed, the repressor detaches from the operator so that RNA polymerase can bind to the promoter and transcription can take place. Miller & Levine Biology 2018-01-01T00:00:00Z The researchers enhanced this silencing effect by hitching Cas9 to a repressor, another protein that inhibits gene expression. Gene-silencing injection reverses pain in mice 2021-03-10T05:00:00Z But efforts by repressors actually backfire plenty of times and increase protest, as opposed to decreasing it. Russia Is Using ‘Digital Repression’ to Suppress Dissent 2022-03-15T04:00:00Z Researchers genetically altered monkeyflowers in the laboratory to observe how the two genes generate an activator molecule and a repressor molecule to produce the stunning variety of the blossoms. Daily briefing: For some people with COVID-19, surviving is just the beginning 2020-05-11T04:00:00Z When tryptophan is present in the cell, two tryptophan molecules bind to the trp repressor, which changes shape to bind to the trp operator. Biology for AP Courses 2022-06-09T00:00:00Z Genes are expressed when RNA polymerase can bind to mRNA at the promoter, and they are not expressed when a repressor binds to the mRNA at the operator. Miller & Levine Biology 2018-01-01T00:00:00Z Putting America first means putting it shoulder to shoulder with serial repressors. Opinion | Trump’s anti-woman push puts America in the pantheon of human rights offenders 2019-09-27T04:00:00Z But the repressor gets more dilute the farther it travels, eventually losing its effect. Meet the monkeyflower, a weed that may hold the key to zebra stripes and other biological mysteries 2019-08-29T04:00:00Z To turn those two into reliable bacteria killers, Hatfull removed the repressor genes with a gene-editing technique his lab developed to study phage genetics. Viruses genetically engineered to kill bacteria rescue girl with antibiotic-resistant infection 2019-05-08T04:00:00Z When tryptophan is not present in the cell, the repressor by itself does not bind to the operator; therefore, the operon is active and tryptophan is synthesized. Biology for AP Courses 2022-06-09T00:00:00Z When lactose is not present, the lac repressor binds to the operator region so that lac genes are not transcribed. Miller & Levine Biology 2018-01-01T00:00:00Z Under normal conditions, the metabolic enzyme mTOR promotes the activity of Pol III by inhibiting a repressor of Pol III, the protein Maf1. Longer life through an odd Pol enzyme And at the June Mimulus meeting, they reported using the red tongue varieties to track down a protein dubbed R3-MYB, the repressor counterpart to the already known activator protein. Meet the monkeyflower, a weed that may hold the key to zebra stripes and other biological mysteries 2019-08-29T04:00:00Z This approach can be used to disrupt the function of repressors such as BCL11A, allowing edited cells to begin producing fetal haemoglobin5. Gene therapy: Erasing sickle-cell disease : Nature : Nature Research 2017-09-26T04:00:00Z If lactose is absent, then the repressor binds to the operator to prevent transcription. Biology for AP Courses 2022-06-09T00:00:00Z The O site is where a DNA-binding protein known as the lac repressor can bind to DNA. Miller & Levine Biology 2018-01-01T00:00:00Z "Dictator, murderer, repressor," is what they called Mr Maduro, as they demonstrated against the president's plan to create a citizens' assembly to draw up a new constitution. Venezuela Maduro: military courts 'used against protesters' - BBC News 2017-05-09T04:00:00Z He also photographed the repressors, and he took some now iconic, memorably revealing candid portraits of Governor Duarte, who is also a member of the national ruling party, the PRI. Who Killed Rubén Espinosa and Nadia Vera? 2015-08-14T04:00:00Z We establish global maps of regulatory elements, define regulatory modules of coordinated activity, and their likely activators and repressors. Integrative analysis of 111 reference human epigenomes : Nature : Nature Publishing Group 2015-02-17T05:00:00Z Therefore, if tryptophan is not needed, the repressor is bound to the operator and transcription remains off. Biology for AP Courses 2022-06-09T00:00:00Z When lactose is not present, the lac repressor binds to the O region and RNA polymerase cannot reach the lac genes to begin transcription. Miller & Levine Biology 2018-01-01T00:00:00Z They arose under Josip Broz Tito, the Communist leader remembered in Bosnia as a guardian of ethnic harmony rather than — as elsewhere in former Yugoslavia — a brutal repressor of nationalist or political dissent. Roots of Bosnian Protests Lie in Peace Accords of 1995 2014-02-15T01:04:20Z To the induction-feed medium, two different inducers/repressors were added to the medium dependent on the strain. High-level semi-synthetic production of the potent antimalarial artemisinin 2013-04-26T14:21:10.803Z When the first gene is on, it produces a repressor protein that keeps the second gene turned off. Synthetic Biology: Bits and pieces come to life 2012-02-29T18:21:16.530Z What would happen if the operator sequence of the trp operon contained a mutation that prevented the repressor protein from binding to the operator? Biology for AP Courses 2022-06-09T00:00:00Z The binding of the repressor protein switches the operon “off” by preventing the transcription of its genes. Miller & Levine Biology 2018-01-01T00:00:00Z This process of vernalization translates environmental temperatures into developmental responses through a cascade of molecular responses that depend on epigenetic regulation of the floral repressor. This Week in Science 2011-01-06T19:25:00.633Z “Even the simple announcement of an intention to demonstrate made the repressors shiver from fear and prompted a wide-scale and comprehensive security and police mobilization,” the statement said. Iran Defends Rights Record Opposition Cancels Rally 2010-06-11T03:01:00Z And when the second gene is on, it produces a repressor protein that keeps the first gene turned off. Synthetic Biology: Bits and pieces come to life 2012-02-29T18:21:16.530Z In both domains, transcription factors, activators, and repressors provide regulation. Biology for AP Courses 2022-06-09T00:00:00Z When lactose is present, some of it attaches to the lac repressor and causes it to fall off the operator. Miller & Levine Biology 2018-01-01T00:00:00Z And those tigers among men and repressors of foes, daily slaying those wild animals and sanctifying them properly, offered them unto the Brahmanas. The Mahabharata of Krishna-Dwaipayana Vyasa, Volume 1 Books 1, 2 and 3 And, O repressor of foes, advancing towards me, standing even then in the field ready for conflict, that wielder of the trident addressed me saying, "I am well-pleased with thee." The Mahabharata of Krishna-Dwaipayana Vyasa Translated into English Prose Vana Parva, Part 2 We shall behold Arjuna, that repressor of foes, fully equipped with celestial weapons, for Vibhatsu having once undertaken a task, never droopeth under its weight. The Mahabharata of Krishna-Dwaipayana Vyasa Translated into English Prose Vana Parva, Part 1 The repressor will bind the operator in the presence of lactose. Biology for AP Courses 2022-06-09T00:00:00Z Prokaryotes regulate gene expression with the help of repressors and activators whereas eukaryotes regulate expression by degrading mRNA transcripts, thereby controlling protein levels. Biology for AP Courses 2022-06-09T00:00:00Z We shall behold Arjuna, that repressor of foes, fully equipped with celestial weapons, for Vibhatsu having once undertaken a task, never, droopeth under its weight. The Mahabharata of Krishna-Dwaipayana Vyasa, Volume 1 Books 1, 2 and 3 The repressor binds to the operator, and RNA synthesis is blocked. Biology for AP Courses 2022-06-09T00:00:00Z And that repressor of foes, having with that sword cut off one half of the cloth, and throwing the instrument away, left the daughter of Vidharbha insensible in her sleep and went away. The Mahabharata of Krishna-Dwaipayana Vyasa Translated into English Prose Vana Parva, Part 1 The repressor will not bind the operator in the presence of lactose. Biology for AP Courses 2022-06-09T00:00:00Z Tryptophan binds to the repressor, and RNA synthesis proceeds. Biology for AP Courses 2022-06-09T00:00:00Z Then all those repressors of their foes, accompanied by their mother and surrounded by many Brahmanas proceeded towards Ekachakra. The Mahabharata of Krishna-Dwaipayana Vyasa, Volume 1 Books 1, 2 and 3 When tryptophan is plentiful, two tryptophan molecules bind the repressor protein at the operator sequence. Biology for AP Courses 2022-06-09T00:00:00Z When tryptophan is absent, the repressor protein does not bind to the operator and the genes are transcribed. Biology for AP Courses 2022-06-09T00:00:00Z The repressor will not bind the operator in the absence of lactose. Biology for AP Courses 2022-06-09T00:00:00Z This operator contains the DNA code to which the repressor protein can bind. Biology for AP Courses 2022-06-09T00:00:00Z And that repressor of foes, having, with that sword cut off one half of the cloth, and throwing the instrument away, left the daughter of Vidharbha insensible in her sleep and went away. The Mahabharata of Krishna-Dwaipayana Vyasa, Volume 1 Books 1, 2 and 3 Binding of the tryptophan–repressor complex at the operator physically prevents the RNA polymerase from binding, and transcribing the downstream genes. Biology for AP Courses 2022-06-09T00:00:00Z If lactose is present, the repressor protein does not bind to its operator. Biology for AP Courses 2022-06-09T00:00:00Z Transcriptional repressors can bind to promoter or enhancer regions and block transcription. Biology for AP Courses 2022-06-09T00:00:00Z In both cell types, regulation occurs using transcription factors, activators, and repressors. Biology for AP Courses 2022-06-09T00:00:00Z And, O repressor of foes, advancing towards me, standing even then in the field ready for conflict, that wielder of the trident addressed me saying, I am well-pleased with thee. The Mahabharata of Krishna-Dwaipayana Vyasa, Volume 1 Books 1, 2 and 3 What would be the result of a mutation in the repressor protein that prevented it from binding lactose? Biology for AP Courses 2022-06-09T00:00:00Z The repressor will bind to lactose when it is removed from the operator. Biology for AP Courses 2022-06-09T00:00:00Z |
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