chapter 37 review

chapter 37 review - Lecture 18 Chapter 37 Plant Growth &...

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I. Tropisms directional growth response elicited by environmental stimulus A. Phototropism 1. directional growth of plant caused by light 2. triggered by blue light with wavelengths less than 500 nm 3. Photoreceptor a. lightsensitive substance that absorbs light b. Phototropins response ii. lightactivated kinase, enzyme that transfers phosphate groups iii. becomes phosphorylated in response to blue light B. Gravitropism 1. growth in response to direction of gravity 2. root cap is site of gravity perception in roots, and when removed, root continues to grow but loses any ability to perceive gravity 3. Amyloplasts a. contain starch b. collect towards bottom of root cap cells in response to gravity c. may initiate some of gravitropic response C. Thigmotropism 1. growth in response to mechanical stimulus, such as contact with a solid object Plant Hormone – organic compound that acts as a signal that functions in the regulation of growth & development; effects of which often occur close to where they are produced Signal Transduction – receptor converts an extracellular signal into an intracellular signal that causes some change in the cell Enzymelinked
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This note was uploaded on 01/18/2012 for the course BIO 101 taught by Professor Martin during the Fall '08 term at Rutgers.

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chapter 37 review - Lecture 18 Chapter 37 Plant Growth &...

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