Question

P700 is named because

• A. it is 700 times more efficient than other pigment molecules
• B. its absorption and action spectra show peaks at 700nm
• C. it is rendered ineffective at wave length above 700nm
• D. it is a unit consisting of 700 chorophyll molecules.

Answer 1

Answer: (B)

: The reaction centre of photosystem I is referred to as P700, where P5 stands for pigment and 700 standing for the wavelength of light that this particular chlorophyll molecule absorbs most strongly (i.e. 700 nm).