The mechanism involved in auxins stimulation of cell

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Unformatted text preview: les and ions in the cell that amplify the signal and transfer it from the receptor to other proteins that carry out the response. second messengers amplify and transfer signals 4. The two main mechanisms by which a signaling pathway can enhance an enzymatic step in a biochemical pathway are transcriptional regulation and post-translational modification. two ways signaling a pathway can enhance an enzymatic step - transcriptional regulation and post- translational modification 5. The factors responsible for the coleoptiles orientation toward light are differential growth of cells on the opposite side of the lighted side. coleopitles grow toward the light because of the differential growth cells on opposite side 6. The experiments that led to the discovery of auxin was F.W. went extracting chemical messengers for phototropism using agar blocks and growing them. extracting chemical messengers for phototropism using agar blocks led to the discovery of auxin 7. The mechanism involved in auxin’s stimulation of cell elongation in developing roots is polar transport due to polar distribution of auxin; transport protein. polar transport= auxins stimulation of cell elongation in developing roots 8. Cytokinins are produced in actively growing tissue (roots, embryos, and fruit); transported in xylem sap (root to shoot). Acting in concert with auxin, they stimulate cell division and differentiation. They have no effect with auxin and other factors, they interact in the control of apical dominance. Retard aging of certain plant organs by inhibiting protein breakdown, stimulating RNA and protein synthesis and mobilizing nutrients from surrounding tissues. 9. The two most important functions of gibberellins are that they have to be present for fruit to develop and they signal seed to dormancy and germinate; used commercially to increase size and …….. the internodes of the grape bunch. gibberelins h...
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This document was uploaded on 03/02/2014 for the course BIO 109 at University of Missouri-Kansas City .

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