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Topics since the last exam.
Note: only #1- #4 below are covered on this review.
Disclaimer: the test may include questions and concepts
not presented in this review (although this is a very good
place to start.)
1. Starch/sucrose partitioning
2. The ecology of photosynthesis
3. Phloem translocation
4. Respiration
5. Nitrogen assimilation and N-fixing symbiosis
6. Secondary chemistry I, II, & III.
1. Starch - sucrose partitioning
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What are the major storage and transport carbohydrates
in plants?
How is starch-sucrose partitioning regulated?
Where does starch accumulate?
2. Ecology of photosynthesis
•Define water use efficiency
•Explain how WUE differs among C3, C4, and CAM
•plants and why.
• How do sun and shade leaves differ anatomically and
physiologically?
•How does the chlorophyll/rubisco ratio differ between sun
and shade leaves? Explain in terms of the limiting factor
for photosynthesis in each case.
•Draw light response curves for sun and shade leaves and
note key differences.
3. Phloem translocation
•List four compounds that are translocated in the phloem.
•Define “source” and “sink” as we’ve used the terms
to understand the direction of phloem translocation.
•How do sieve tube elements differ from tracheary elements?
•Draw a figure that illustrates the Münch pressure-flow model
of phloem translocation from a source to a sink.
•Give representative values for the components of water
potential in the phloem and xylem.
•Where is energy involved in phloem translocation?
•Be able to interpret 14C autoradiograms as we’ve used them
for tracing the movement of photoassimilate.
•How have aphids been used in understand phloem composition?
4. Plant respiration
What are the major products of respiration?
What is the major byproduct of respiration that is often
measured to understand respiration rate?
Write a balanced equation for the complete oxidation of one
sucrose molecule.
What are the major stages of respiration? Which can
proceed in the absence of oxygen?
Explain what the alternative oxidase is, how it affects
respiratory energy production, and what its function may be
in plants.
Draw a figure illustrating how the p.m.f. and ATP production
are oriented across the mitochondrial membrane system.