Photosynthesis is similar to cellular respiration, in that it is a process of obtaining energy. However, while cellular respiration is completed through animals (and some plants) by converting food and organic molecules to energy, photosynthesis is the process of converting energy from light sources.
AP Biology Essay Questions. The following is a comprehensive list of essay questions that have been asked on past AP exams. The questions are organized according to units. The lab-based questions have been removed. Unit 1 (Basic Chemistry and Water) 1. The unique properties (characteristics) of water make life possible on Earth.