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BIO 127 Notes week of 2/15/16

by: Sarah Jessica Harris

BIO 127 Notes week of 2/15/16 630247

Marketplace > Pennsylvania State University Altoona > Biology > 630247 > BIO 127 Notes week of 2 15 16
Sarah Jessica Harris
Pennsylvania State University Altoona
GPA 3.22

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These notes cover material from MWF, of 2/15/16.
Introduction to Plant Biology
Dr. James Winsor
Class Notes
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This 2 page Class Notes was uploaded by Sarah Jessica Harris on Friday February 19, 2016. The Class Notes belongs to 630247 at Pennsylvania State University Altoona taught by Dr. James Winsor in Spring 2016. Since its upload, it has received 12 views. For similar materials see Introduction to Plant Biology in Biology at Pennsylvania State University Altoona.

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Date Created: 02/19/16
BIO 127 NOTES (WEEK OF 2/15/16)    Root pressure:​  the plant expends energy in the roots, forcing water up through the plant    Cohesion Tension Theory:​  how water moves up the plant (a “vital process”)     Suberin: ​waxy material (think of the casparian strip)    Strasburger​  concluded that there could not be a “vital process” involved in the cohesion tension  theory, after his experiment with poisoning a plant and observing how it moved up the plant. He  concluded that this could not be an energy consuming process.    Bulk Flow: ​source (sugars, etc…) sink (roots, or some other non photosynthetic structure)  water and minerals move together “in bulk” due to pressure gradient    Forces:     Adhesion: ​ hydrogen bonding. Attraction of water molecules to xylem walls.   Cohesion: a ​ttraction of water molecules to each other  Tension: n​ egative pressure (causes the movement)    (these 3 forces account for the movement of water from the xylem to the top of the plant)    Steps:    Soil ­> Root Hair  (water by osmosis; uses ATP for the minerals)  Root Hair ­> Stele ​(apoplastic pathway ­ between cells. symplastic pathway ­ through cells.  across endodermis ­ symplastic pathway)  ­>xylem ​(from across the endodermis)    Remember  C H O P K I N S CaFe ­ Mg    Light Dependent Reactions ­  usually temperature independent (suggests that these are  chemical reactions, nonenzymatic. Also called “Hill reactions”  ­ Noncyclic Flow: ATP, NADPH, O2 is produced and water is split  ­ Cyclic Flow: ATP 


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