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Unformatted text preview: BILD 2 MIDTERM REVIEW Lecture 1 (Ch. 39.2) • A coleoptiles , enclosing the shoot of a grass seedling, bends toward the light when illuminated from one side because of elongation of cells on darker side • Gibberellins stimulate growth • Abscisic Acid (ABA) slows growth. • Ethylene is produced by plants in response to stress and during fruit ripening and program med cell death • Ethylene initiates triple response , which is slowing of stem elongation, thickening of stem and initiation of horizontal growth • Senescence is the program med death of plant organs or whole plant • Apoptosis , or programmed cell death, requires synthesis of new enzymes that break down many cellular components, which plant may salvage • Ethylene promotes fruit ripening; initiates triple response; involved in apoptosis. • Cytokinins stimulate cell division, growth, and germination; anti-aging. • Abscisic Acid (ABA) inhibits growth; maintains dormancy; closes stomata during water stress. • Auxin stimulates stem elongation, root branching, fruit development; apical dominance • Brassinosteroids promote cell elongation and division, xylem differentiation; retard leaf abscission • Gibberellins promote stem elongation, seed germination; contributes to fruit set. • Gibberellins are necessary for a seed to break dormancy • Cytokinins , synthesized in the root, counteract apical dominance • Polar transport of Auxin involves movement of Auxin through transport proteins located only at the basal ends of cells • Which of the following situations would most likely stimulate the development of axillary buds? o A small amount of auxin travelling down from the shoot and a large amount of cytokinin travelling up from the roots • The growth inhibitor in seeds is usually Abscisic Acid • Which of the following hormones would be sprayed on barley seeds to speed germination in production of malt for making beer? o Gibberellin Lecture 2 (Ch. 40.1-40.2, 45) • Interstitial fluid – exchange surfaces in the circulatory system • Epithelial tissue lines the outer and inner surfaces of the body in sheets of tightly packed cells • Lumen – outside of an organ • Connective tissue binds and supports other tissues and relatively few cells suspended in an extracellular matrix of fibers e mbedded in a liquid, jellylike or solid formation 1. Collagenous fibers: made of collagen and have nonelastic strength 2. Elastic fibers: made of protein elastin, can stretch and provide resilience 3. Reticular fibers are composed of collagen and form a tightly woven connection with adjacent tissues....
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This note was uploaded on 07/25/2009 for the course BILD 2 taught by Professor Schroeder during the Fall '08 term at UCSD.
- Fall '08