lecture 34 posted W11

lecture 34 posted W11 - Lecture 34 (4-8-11) - Chemical...

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Lecture 34 (4-8-11) - Chemical signaling in plants 1) Describe how plants respond to light via auxin signaling 2) Review how plants respond to gravity via auxin signaling 3) Go over apical dominance and discuss how auxin does so many different things. 4) Describe how roots signal to shoots via Abscisic acid (ABA)
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Molecules; Chemical bonds; Free energy Lipids Amino acids nucleotides carbohydrates membranes proteins Membrane transport Membrane proteins cytoskeleton enzymes DNA RNA Metabolism Sugar transport Electrolyte transport Kidney Nerve cells Transporters and pumps Receptors Cell-cell communication Chemical signaling development Replication transcription translation Glycolysis Fermentation Krebs cycle Photo- Synthesis & Calvin cycle Cell cycle Regulation of transcription biotechnology genomics Microbes Biology 172 flowchart (lecture 34) cancer epigenetics
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Figure 39-1 STEPS IN INFORMATION PROCESSING External stimulus on receptor cell Internal signal Cell-cell signal Internal signal 1. Receptor cell perceives external stimulus and transduces the information to an internal signal. 2. A hormone (cell-cell signal) released by the receptor cell travels throughout the body. 3. Receptor cells receive the hormonal (cell-cell) signal, transduce it to an internal signal, and change activity.
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Chlorophyll b Chlorophyll a Different pigments absorb different wavelengths of light Plants prefer blue light for photosynthesis
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Shoots bend toward full-spectrum light. Shoots bend specifically toward blue light. The PHOT1 gene is required for shoot bending towards blue light.
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Is the PHOT1 protein a direct blue light sensor?
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Blue light PHOT1 ADP ATP ATP Phosphorylated PHOT1 PHOT1 senses blue light directly Phosphorylated PHOT1 initiates a signaling cascade that generates a signal that induces shoot bending
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Where does PHOT1 act?
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is a potent signaling molecule called auxin
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lecture 34 posted W11 - Lecture 34 (4-8-11) - Chemical...

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