Question

The active component of photosystem-I composed of

• A. chlorophyll-a with absorption peak at 680 nm
• B. chlorophyll-a with absorption peak at 700 nm
• C. chlorophyll-b with absorption peak at 680 nm
• D. chlorophyll-a chlorophyll-b with absorption peak at 700 nm

Answer 1

Answer: (B)

chlorophyll-a with absorption peak at 700 nm

The reaction center of photosystem-I is composed of two chlorophyll molecules and is therefore referred to as a dimer. The dimer is composed of one chlorophyll a molecule and one chlorophyll a' molecule with absorption peak at 700 nm.

Thus, the correct answer is 'chlorophyll a with absorption peak at 700 nm.'