PSI absorbs wavelengths near ______.

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Multiple Choice

PSI absorbs wavelengths near ______.

Photosystems have specific absorption peaks tied to their reaction centers. PSI’s reaction center, called P700, absorbs light most efficiently around 700 nm, placing it in the red to near-infrared part of the spectrum. This contrasts with PSII, whose reaction center P680 absorbs best around 680 nm. So the best match for PSI is near 700 nm, while 680 nm aligns with PSII, and 600 nm or 520 nm are not the primary absorption peaks for the two photosystems.

Photosystems have specific absorption peaks tied to their reaction centers. PSI’s reaction center, called P700, absorbs light most efficiently around 700 nm, placing it in the red to near-infrared part of the spectrum. This contrasts with PSII, whose reaction center P680 absorbs best around 680 nm. So the best match for PSI is near 700 nm, while 680 nm aligns with PSII, and 600 nm or 520 nm are not the primary absorption peaks for the two photosystems.

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