W8L3 - Transport in Plants

W8L3 - Transport in Plants - Biol 5B: Organismal Biology...

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1 Biol 5B: Organismal Biology Spring ’09 WEEK 8; Lecture 3 Transport in Plants Land plants acquire resources both above and below ground • Algal ancestors of land plants absorbed water, minerals, and CO 2 from surrounding water • Evolution of xylem and phloem in land plants made possible the long-distance transport of water, minerals, and products of photosynthesis • Adaptations represent compromises between enhancing photosynthesis and minimizing water loss
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2 H 2 O H 2 O and minerals H 2 O H 2 O and minerals CO 2 O 2 O 2 CO 2
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3 H 2 O H 2 O and minerals CO 2 O 2 O 2 CO 2 Sugar Light Transport • Transport occurs by – short-distance diffusion or active transport – long-distance bulk flow • Transport begins with the absorption of resources by plant cells • The movement of substances into and out of cells is regulated by selective permeability of the plasma membrane
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4 Diffusion and Active Transport of Solutes • Diffusion across a membrane is passive transport Active transport is the pumping of solutes across a membrane – requires energy (ATP) • Most solutes pass through transport proteins embedded in the cell membrane Active Transport of Solutes • The most important transport protein for
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This note was uploaded on 06/07/2009 for the course BIOL 05 taught by Professor Helen during the Spring '09 term at UC Riverside.

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W8L3 - Transport in Plants - Biol 5B: Organismal Biology...

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