What is the main source of energy in a clear water stream in an open area a. algal blooms b. dead leaves c. sunlight d. chemosynthetic bacteria

Asuspension of yeast cells is being grown under anaerobic conditions such that glucose is degraded to ethanol and carbon dioxide. if one wishes to follow this process by monitoring the release of 14co2, at which positions in the glucose molecule would the 14c label need to be incorporated?