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• Stand up if full group, Ch.10, play?

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• Interview with Prof by 13th

• “Verbal finals” begin when?

• How do I read the online gradesheet?

How the grade sheet works

Question: Which of the following does not occur during the Calvin cycle?  

A. carbon fixation B. oxidation of NADPH C. release of oxygen D. regeneration of the CO2 acceptor E. consumption of ATP

Question: Which process is most directly driven by light energy?

A. creation of a pH gradient by pumping protonsB. carbon fixation in the stroma C. reduction of NADP+ molecules D. removal of electrons from chlorophyll molecules E. ATP synthesis

Question: How is photosynthesis similar in C4 plants and CAM plants?    

A. in both cases, only photosystem I is used. B. both plants make sugar without Calvin cycle. C. in both, rubisco is not used to fix carbon initially. D. both plants make most of their sugar in the dark. E. in both, thylakoids are not involved in PHS.

Thin Air...CO2

CO2CO2

Where do plants get their ‘food’...

Short Experiment:

Growing radishes from seed

Biology Radish ProblemWeighed out 3 batches of radish seeds (each 1.5

g).Experimental treatments:

» 1. Seeds not moistened (dry) placed in LIGHT » 2. Seeds on moistened paper towels in LIGHT» 3. Seeds on moistened paper towels in DARK

After 1 week, all plant material was dried & weighed.

• TASK: Predict the (dried) biomass of the plant material in the various treatments.

Predict the final (dried) bio-mass [increase/decrease/no change]

A. no change – increase – no changeB. increase – increase – increaseC. increase – decrease – no changeD. decrease – increase – decreaseE. None of the above are correct

Results: Weight of Radish Seedlings

1.46 g 1.63 g 1.20 g

How do you explain the results?(Remember all treatments started as 1.5g).

Who got the Nobel: For discovering the steps of the

Calvin Cycle?

1. First stable product of Calvin Cycle

(3-PG)3-Phosphoglycerate

*C-C-C-P

Question: What size molecule was the radioactive C-14 likely attached to (fixed to)?

1. Fixation

Rubisco

Phosphoglycero(PG)-kinase

Glyceraldehyde-3-phosphate(G3P)-dehydrogenase

Ribulose bisphosphate(RuBP)-carboxylase

PG kinase G3P dehydrogenase

2. Reduction

Biology Theater!