High Concentration of H+Ions Is Stored Potential Energy


Light reactions: Light energy + ____________ �� ATP + _______________ + ________________

Calvin cycle: ATP + ________________ + ________________ �� __________ + ADP + NADP +

Light Reactions

1. Light energy from _______________ pigments is passed to chlorophyll a in Photosystem _____.

2. a. A pair of _________________ from chlorophyll a are excited and caught by an


b. A water molecule is ________________ to replace the excited ________________.

__________ gas is released.


3. The excited electron travels down the _________________________________________.

a. The electron transport chain consists of _________________ molecules embedded in

the ______________________ membrane.

b. As the electrons pass through each __________________, ______________ is released.

c. The released __________________ powers the active transport of ___________.

d. The high concentration of __________ is stored potential energy.

e. Hydrogen ions flow down its concentration gradient through _____________________

which attaches a _________________ to _________ to make ATP.

4. The electrons are re-excited in Photosystem ________.

5. The re-excited electron is passed to the final electron carrier to form _______________.

Calvin Cycle

6. In the ____________ of the chloroplast, the enzyme rubisco attaches _________ to a 5-carbon

intermediate. This step is called ________________ __________________. The new 6-carbon

intermediate splits into two 3-carbon molecules.

7. _________ and ______________ from the light reactions are used to reduce the 3-carbon

intermediates to _____________; some exit the Calvin Cycle to form _______________.

8. Some product is used to regenerate the 5-carbon intermediate for another __________ to fix.

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