Carbohydrate lab student question data sheet pre lab questions 1 what elements make up all carbohydrates 2 what is the general formula for any monosaccharide 3 using benedicts and iodine tests how can you tell if a carbohydrate is the . Carbohydrates are an energy source or are used in making cell structures objectives upon completing this lab you will 1 biology carbohydrate test question data sheet names pre lab questions write your responses to these questions on your lab sheet 1. Carbohydrates serve as an energy source and may be used in making cell structures objectives upon completing this lab the student will be able to 1 write a molecular formula for several carbohydrates 2 write your responses to these questions on your lab data sheet examine the chemical formula of water h 2 o 1. Record results on data table 1 5 remove the unknowns from the tubes and thoroughly clean and rinse the microcentrifuge tubes 6 repeat steps 1 5 using appropriate quantities of test chemicals to test for proteins lipids and carbohydrates following the tests outlined on the following page 7 answer questions for part i