20) Transports of Sugars (Translocation)

20) Transports of Sugars (Translocation) - AP Biology...

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AP Biology Transports of Sugars (Translocation) 1) Background Information a) Phloem Sap = The aqueous solution that flows through sieve-tubes b) Most prevalent solutes are sugars (sucrose), but can contain other solutes (i.g amino acids, hormones, and minerals) c) Sugar source = A net producer of sugars by photosynthesis d) Sugar sink = An organ that consumes or saves sugars in the plants 2) Molecular Perspective a) Sugars must be transported or loaded into the sieve-tube elements before being transported into the sinks: either directly through plasmodesmata (symplast) or interchangeably uses both symplasts and apoplasts – Figure 1 b) Chemiosmosis Mechanism As the proton pumps pump out the hydrogen ions out of the cell by using active transport, the hydrogen ions will be accumulated at the outside As the formation of hydrogen gradient, the hydrogen ions will be used for cotransport. This means that the sucrose molecules will be coupled with the hydrogen ions. 3)
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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 University of Wisconsin.

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20) Transports of Sugars (Translocation) - AP Biology...

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