sign an experiment to test your hypotile 30. Glyphosate is an herbicide used to

Question

sign an experiment to test your hypotile 30. Glyphosate is an herbicide used to kill weeds. It is the main component of a product made by the Monsanto Company called Roundup. Glyphosate kills plants by,in lled hibiting an enzyme in the shikimate pathway ca EPSP S. This herbicide is considered safe because animals do not have the shikimate pathway. To sell even more of their herbicide, Monsanto commissioned its plant geneti- cists to engineer several crop plants, including corn, to be resistant to glyphosate. To do so, the scientists had to in troduce an EPSPS enzyme that was resistant to inhibition by glyphosate into crop plants and then test the trans- formed plants for resistance to the herbicide. Imagine that you are one of these scientists and that you have managed to successfully introduce the re- sistant EPSPS gene into the corn chromosomes. You find that some of the transgenic plants are resistant to the herbicide, whereas others are not. Your supervisor is very upset and demands an explanation of why some of the plants are not resistant even though they have

Explanation / Answer

30). The relationship between the enzyme and substrate is specific. In the given case, some of the plants failed to develop resistance against glyphosate although they had the transgenic resistant EPSPS gene. This might occur because of two reasons, one is, the glyphosate is inhibiting another enzyme necessary for the plant survival (in the transgenic susceptible plants), or the transgenic plants is not expressing the gene and not synthesizing the enzyme necessary to resist the effect of glyphosate.

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