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Sheath

sheath

A protective covering.

The lower part of leaf enveloping stem or culm.

A secreted, tubular structure formed around a chain of cells or around a bundle of filaments, cells within a sheath may or may not subsequently separate from the sheath.

a layer of outer membrane covering the bacterial flagella.


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Photosynthesis question

in C4 photosynthesis, does carbon fixation take place in the mesophyll and then transferred to the bundle-sheath cells where CO2 is released for entry into the Calvin Cycle? Or have I got this all wrong? Thanks

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by seders99
Sat Apr 04, 2009 11:54 pm
 
Forum: Ecology
Topic: Photosynthesis question
Replies: 6
Views: 768

Photosynthesis Trivia

... True/False Section 1. The wavelengths of light most effective in photosynthesis are those in the green part of the visible spectrum. 2. Bundle sheath cells are associated chiefly with C-3 photosynthesis and contain many chloroplasts. 3. CAM metabolism is chiefly associated with plants in cool, ...

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by vstexas09
Mon Oct 13, 2008 12:46 am
 
Forum: Cell Biology
Topic: Photosynthesis Trivia
Replies: 5
Views: 5342

C4 and photorespiration

... to give phosphate and oxaloacetate which is then reduced to malate in the mesophyll cell. then the malate goes to the bundle sheath cell, where it is "broken down" back to CO2. the CO2 can then be fixed by Rubisco with minimum photorespiration, because there is not ...

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by MrMistery
Wed Sep 24, 2008 2:25 am
 
Forum: Botany Discussion
Topic: C4 and photorespiration
Replies: 1
Views: 1054

Myelin Sheath

No. The myelin sheath doesn't let disperse for electric impulses. And the more myelin (the larger diameter of neuron) the faster electric impulses are conducted.

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by MisterATP
Sat Aug 23, 2008 3:49 pm
 
Forum: Cell Biology
Topic: Myelin Sheath
Replies: 1
Views: 820

Myelin Sheath

Hi there, We are currently studying about nerves/neurons. I heard that messages can travel along a neuron much quicker if we are warming up/exercising ... Does anyone know why this happens and how this is related to myelin sheaths? My only guess is that because the fatty layer of myelin becomes more...

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by micco13
Sat Aug 23, 2008 7:51 am
 
Forum: Cell Biology
Topic: Myelin Sheath
Replies: 1
Views: 820
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