ATP and NADPH production Place the correct word(s) in each sentence to assess yo

Question

ATP and NADPH production Place the correct word(s) in each sentence to assess your understanding of the cyclic and noncyclic electron pathways of photosynthesis. Two types of light reactions occur in thylakoid membranes. One type is named the _______ electron pathway, because the electron flow can be traced from water to a molecule of _______ . The second type is called the _______ electron pathway, because energized electrons are passed down an electron transport chain and then returned to their source. The noncyclic electron pathway uses two photosystems, called photosystem I and photosystem Il. A photosystem consists of a pigment complex and an _______ within the thylakoid membrane. In the noncyclic electron pathway, the pigment complex associated with photosystem _______ first absorbs solar energy, which becomes concentrated in a . Energized electrons then escape to a nearby electron acceptor, followed by replacement of these electrons provided by the splitting of . This process also releases _______ to the atmosphere. The cyclic electron pathway begins when the pigment complex associated with photosystem _______ absorbs solar energy, which becomes concentrated. In this system however, the ________ are sent down an ________ and eventually returned to the same photosystem. Both photosystems result in a gradient of _______ ions, which can flow down their electrochemical gradient through _______ complexes in the thylakoid membranes to produce ATP. The noncyclic electron pathway produces ATP plus reducing power in the form of , which is needed for the Calvin cycle. In contrast, the cyclic pathway produces extra _______ that can be used by the Calvin cycle or for other reactions.

Explanation / Answer

1. non cyclic, NADP+ and Cyclic

2. reaction center

3. photosystem II, Energized Electron, water and oxygen.

4. Photosystem I , Energized Electron and Electron transport chain

5. Energized Electron and Electron Acceptor

6. NADPH and ATP

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