Final answer:
A cell that uses an organic carbon source and obtains energy from light is called a photoheterotroph, capturing light to create energy while using organic compounds for carbon.
Step-by-step explanation:
A cell that uses an organic carbon source and obtains energy from light would be called a photoheterotroph. The term 'photoheterotroph' refers to organisms that capture light energy to convert to chemical energy in the cells, but they get carbon from organic sources rather than inorganic carbon dioxide. Examples of photoheterotrophs include purple non-sulfur bacteria, green non-sulfur bacteria, and heliobacteria. On the other hand, chemoheterotrophs obtain both their energy and carbon from organic compounds, and examples include many eukaryotes and humans. Photoautotrophs are organisms like plants and cyanobacteria, which use light energy and carbon dioxide to produce their own food.