Definition: Given a scientific passage and an answer, generate a question for the given answer.
Input: Passage: Photosynthetic bacteria use the energy of the sun to make their own food. In the presence of sunlight, carbon dioxide and water are turned into glucose and oxygen. The glucose is then turned into usable energy. Glucose is like the "food" for the bacteria. An example of photosynthetic bacteria is cyanobacteria, as seen in the opening image. Answer: food
Output:
What is glucose used for the bacteria?