A photosystem is a complex of pigments, proteins and reaction center chlorophylls. T/F: rubisco can function as either a carboxylase or an oxygenase. oxidized to oxygen gas in the light. conversion of light energy to chemical energy. Photosynthesis is the pathway used to synthesize carbohydrates from: sunlight and carbon dioxide. Photosynthetic pigments that absorb light from regions of the visible spectrum not absorbed by chlorophyll are referred to as ___________.