22) Auxins - 4 Inquiry 3 – Figure 4 a Leo Galweiler and...

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AP Biology Auxins 1) a) Also known as IAA b) Produced from apical meristems (young parts of the plants) c) Various functions: Response to the light (phototropism) and elongations 2) Inquiry 1 – Figure 2 a) Control = Exposed to the light b) Darwin and Darwin = Covered the parts of the plants to determine which parts actually sense lights with not-transparent substance c) Boysen-Jensen = Separated the apical meristems with transparent substance and not-transparent substance d) Results = In the Darwin-Darwin, the phototropism was shown in the apical meristems. In the Boysen-Jensen, the phototropism was shown in the presence of transparent substance 3) Inquiry 2 – Figure 3 a) Went extracted the chemical messenger for phototropism, auxin, by modifying earlier experiments b) Results = Went concluded that the plants with auxins would curve toward light because the dark side will have a high concentration of auxins
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Unformatted text preview: 4) Inquiry 3 – Figure 4 a) Leo Galweiler and colleagues proved that the auxin transporters move the hormone out of the basal end of one cell, and into the apical end of neighboring cells; this polar movement of auxin was proved by dying the plants 5) The Acid Growth Hypothesis – Figure 5 a) Auxin stimulates the proton pumps and the cell wall therefore becomes acidic b) This low pH separates cellulose microfibrils from cross-linking polysaccharides c) This exposed cross-linking polysaccharides are now more accessible to the cell wall-loosening enzymes by the enzymes d) These cross-linking polysaccharides microfibrils are allowed to slide to each other. The turgor causes the cell to expand since the cellulose is loosened. <Figure 1> - Molecular Structure of Auxin <Figure 2> - Inquiry 1 <Figure 3> -Inquiry 2 <Figure 4> - Inquiry 3 <Figure 5> - Acid-Growth Hypothesis...
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22) Auxins - 4 Inquiry 3 – Figure 4 a Leo Galweiler and...

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