This file is licensed under the creative commons attributionshare alike 3. The lac operon the lac operon of the model bacterium escherichia coli was the first operon to be discovered and provided a typical example of operon function. The lac operon is a set of genes which are responsible for the metabolism of lactose in some bacterial cells. The lac operon is a group of genes that controls lactose breakdown the lac operon can be simplified as a group of genes required for the transport and breakdown of lactose into energy in e. Lac proteins are produced, and more lactose is brought into the cell. Introdution bacterial operon lac operon structure of lac operon the first control mechanism is the regulatory response to lactose the second control mechanism is a response to glucose lactose analogs classification of regulatory mutant multimeric nature of repressor and the complex operator regulation by cyclic amp mechanism of. The lac operon is an operon, or group of genes with a single promoter transcribed as a single mrna. If youre seeing this message, it means were having trouble loading external resources on our website. The protein that inhibits transcription of the lac operon is a tetramer with four identical subunits called lac repressor. Theyll give your presentations a professional, memorable appearance the kind of sophisticated look that todays audiences expect. The lac operon encodes a set of genes that are involved in the metabolism of a simple sugar, lactose.
Winner of the standing ovation award for best powerpoint templates from presentations magazine. Prokaryotic gene expression operon concept the lac operon an inducible system operon is the co ordinated unit of gene expression in bacteria this concept was introduced by jacob and monod in 1961 it was based on their observations on the regulation of lactose metabolism in ecoli it is called as lac operon. Transcription, rna processing, and transcriptional regulation. Although glucose is the preferred carbon source for most. Prokaryotes and eukaryotes chapter 11 lac operon trp operon trp operon levels of chromatin packing x chromosome inactivation and tortoiseshell cat tortiseshell cat x chromosome. It is the inducible operon since the presence of lactose induce the operon to switched on. Worlds best powerpoint templates crystalgraphics offers more powerpoint templates than anyone else in the world, with over 4 million to choose from. The biochemistry of the lactose lac operon explains many principles of regulation. Ppt lac operon powerpoint presentation, free download id. And they discovered the mechanism of the lac operon. Ideal for use in the classroom, student learning or general knowledge. The enzymes required for the use of lactose as a source of carbon are synthesised only when the lactose is available as carbon source.
And the lac stands for the word lactose and the lac operon is found in the bacteria e. The lac operon consists of 3 genes that the bacteria e. The lac operon article gene regulation khan academy. Find powerpoint presentations and slides using the power of, find free presentations research about operon. Regula o da express o g nica em procariotos 1 operon lac 2regula o negativa do operon lac 3regula o positiva do operon lac 4 operon lac. If you continue browsing the site, you agree to the use of cookies on this website. The lac operon is an example of nagatively controlled inducible operon. Gene regulation of the lac operon was the first genetic regulatory mechanism to be understood clearly, so it has become a foremost example of prokaryotic gene. The lac operon consists of three genes each involved in processing the sugar lactose. This helps you give your presentation on lac operon in a conference, a school lecture, a business proposal, in a webinar and business and professional representations the uploader spent hisher valuable time to create this lac operon.
The genes of the lac operon are only transcribed in the presence of lactose or another chemically similar inducer in the absence. If so, share your ppt presentation slides online with. The lac operon the lactose operon designated as lac operon. Download predesigned 0914 lac operon medical images for powerpoint powerpoint templates, ppt slides designs, graphics, and backgrounds at reasonable. Like the lac operon, the trp operon is a negative control mechanism. View transcription ppts online, safely and virusfree. Gene regulation and the lac operon molecular biology. Q operator gene of lac operon is turned on when lactose molecules bind to 1 t it1 promoter site 2. There is a very extensive wikipedia article on this. Media in category lac operon the following 10 files are in this category, out of 10 total. Jacob and monod began their studies of this operon in e. Powerpoint is the worlds most popular presentation software which can let you create professional lac operon powerpoint presentation easily and in no time. Presentations ppt, key, pdf logging in or signing up. In this activity you will use the provided template to have students make a paper model of the.
Regulation of the lac operon practice khan academy. Although glucose is the preferred carbon source for most bacteria, the lac operon allows for the effective digestion of lactose when glucose is not available through the activity of betagalactosidase. Using this worksheet and interactive quiz, test your understanding of operons. Explore the effects of mutations within the lac operon by adding or. The lac operon codes for enzymes involved in the catabolism degradation of lactose. To justify the benefit to an organism of regulating genes. Polycistronic template r n a products of the lac operon in e. After first appearing in the cellular environment, lactose passively enters the e. Then compounds were discovered that could act as inducers but were not. For this session, watch the first 30 minutes of the video lecture called gene regulation by prof.
Ppt lac operon powerpoint presentation free to view. View and download powerpoint presentations on operon concept ppt. Ppt l1 the lac operon powerpoint presentation free to. Vis o geral powerpoint ppt presentation free to download. Unit 7 operon concept free download as powerpoint presentation. The lac operon in the bacterium escherichia coli functions by a repression mechanism in which an inhibitor protein laci binds to regulatory sites laco in the promoter and turns off transcription fig. Practice regulation of the lac operon with khan academy s free online exercises. L1 the lac operon is the property of its rightful owner. Ppt gene regulation powerpoint presentation free to view id. The repressor is an example of an allosteric protein. As shown above, the trp operon encodes five enzymes in the biosynthetic pathway.
That is a protein that changes from one conformation to another these changes alter the function of the. A free powerpoint ppt presentation displayed as a flash slide show on id. Teaching gene regulation in the high school classroom, ap. To predict the phenotype caused by different mutations within the lac operon. There is also a positive control system operating in the lac operon.
Powerpoint presentations on a range of genetics topics. It was the first example of gene control to be worked out. The lac repressor is encoded by the laci gene, located upstream of the lac operon and has. The lactose operon lac operon is an operon required for the transport and metabolism of lactose in li and many other enteric bacteria. Free download lac operon powerpoint presentation slides.
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