What substance would be expected if a test tube containing yeast glucose and water for 24 hours?

If a test tube containing yeast, glucose, and water is left for 24 hours, fermentation is likely to occur. The yeast will consume the glucose and produce carbon dioxide and ethanol as byproducts. Thus, after 24 hours, you would expect to find ethanol and carbon dioxide in the solution, along with some residual glucose that may not have been fully consumed.