Chapter 36 Notes (Transport of plants)

Chapter 36 Notes - Chapter 36 Notes(Transport in Plants AP Biology Honors Human Anatomy 1 Basic Overview of Transport Osmotic pressure decreases

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1. Basic Overview of Transport →→→→→→→→→→→→→→→→→→→→→→→→→→→→→ Osmotic pressure decreases Water and minerals from the soil → Root Hairs → Endodermis → Xylem → Leaves Store foods to the soil ← Root Hairs ← Endodermis ← Phloem ← Transpiration + Photosynthesis ←←←←←←←←←←←←←←←←←←←←←←←←←←←←← Osmotic pressure increases 2. Major forces that cause transport of materials in plants a. Membrane Transport i. Passive transport Slow movement through the lipid bilayer of a membrane by concentration gradient. A substance FLOWS rather than PUMPING. ii. Active transport Pumping of solutes across the membrane. Hydrolysis of ATP … there is an input of energy. Transport of solute against a concentration gradient. A specific transport protein in the membrane. A substance is being PUMPED rather than FLOWED. b. Proton Pump i. Proton gradient (The difference of hydrogen ions) is formed. ii. Creates a membrane potential separation of opposite charges across a membrane - Stores potential energy on one side of a membrane. iii. Proton pump functions in cotransport- downhill passage of one solute (H+) are coupled with the uphill passage of another, such as sucrose. iv. Cotransport enables root hairs to absorb cations. v. Chemiosmosis - A unifying principle of cellular energetics that links energy-releasing processes to energy-consuming processes c. Aquaporins i. Aquaporins – proteins that are involved in water movement. ii. Affect the rate of water transport across membrane, not osmotic pressure. d.
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This note was uploaded on 02/11/2012 for the course ZOOLOGY 152 taught by Professor Stephengammie during the Fall '11 term at Wisconsin.

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Chapter 36 Notes - Chapter 36 Notes(Transport in Plants AP Biology Honors Human Anatomy 1 Basic Overview of Transport Osmotic pressure decreases

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