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Select the most accurate statement describing the basic function of the light reactions of photosynthesis.

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Question: Select the most accurate statement describing the basic function of the light reactions of photosynthesis.

The most accurate statement describing the basic function of the light reactions of photosynthesis is:

The light reactions of photosynthesis use light energy to convert water into NADPH and oxygen, and to store energy in ATP.

The light reactions take place in the thylakoids, which are membrane-bound sacs found within the chloroplasts of plant cells. Chlorophyll, a green pigment that absorbs sunlight, is embedded in the thylakoid membranes.

When sunlight hits a chlorophyll molecule, an electron is excited and moves to a higher energy level. This electron is then passed through a series of electron carriers, which ultimately donate the electron to NADP+, forming NADPH.

During this process, protons are pumped from the stroma (the fluid outside of the thylakoid) into the thylakoid lumen (the fluid inside of the thylakoid). This creates a proton gradient, which drives the synthesis of ATP from ADP and Pi.

The oxygen produced in the light reactions comes from the splitting of water molecules. The protons released during this process contribute to the proton gradient.

The light reactions are essential for photosynthesis because they produce NADPH and ATP, which are used in the Calvin cycle to convert carbon dioxide into sugar.

The other statements are not as accurate:

  • The light reactions do not produce oxygen directly. Oxygen is produced as a byproduct of the splitting of water molecules.
  • The light reactions do not store energy directly. Energy is stored in ATP, which is produced during the light reactions.
  • The light reactions do not convert carbon dioxide into sugar. This occurs in the Calvin cycle.

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