Wednesday, November 12, 2008

Summary, Vocab., Concept Check of 8.3

Vocabulary of Chp. 8.3

Summary of 8.3

The Calvin cycle is like sugar factoy within a chloroplast. The Calvin cycle is a cycle because the starting material that gets regenerated is a compund that's a sugar with five carbons. In every turn of the Cycle there are chemical inputs and outputs. The inputs are carbon dioxide and the ATP and NADPH produced by the light reactions. The cycle uses carbon from carbon dioxide, energy from ATP, and high-energy elections and hydrogen ions from NADPH. The cycle's output is a sugar molecule rich in energy. The sugar molecule isn't glucose, but a much smaller molecule called G3P. G3P is used in a plant cell as raw material to make the organic molecules the plant cell needs.
The equation for photosynthesis is:
6CO2 + 6H2O >>> C6H12O6 + 6O2
Light reactions use the reactant water in the equation above to release the product oxygen. The cycle takes place in the stroma of a chloroplast, using ATP and NADPH to convert carbon dioxide into sugar. By converting light energy into chemical energy, some of the energy is passed on to consumers.

Concept Check 8.3

1. The inputs of the Calvin cycle are carbon dioxide, energy from ATP, and electrons and hydrogen ions from an NADPH. The output is an energy-rich sugar molecule called G3P.

2.The Calvin cycle uses every reactant from the overall photosynthesis equation. Also the Calvin cycle generates each product from the overall photosynthesis equation.

3. The Calvin cycle is called a cycle because the starting material is regenerated each time the process occurs.

4. The G3P molecule is a direct product of the photosynthesis. The G3P molecule is used to produce organic molecules that a plant cell needs.

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