An important difference between cellular respiration and photosynthesis is that when cellular respiration begins, glucose molecules are split. however, when photosynthesis begins

The answer is water molecules are split.

Cellular respiration and photosynthesis are complement reactions to each other. These are reverse reactions. In cellular respiration glucose and oxygen yield water and carbon dioxide. So, when respiration begins, glucose molecules are split. In the opposite reaction - in photosynthesis, carbon dioxide and water yield glucose and oxygen. Thus, when respiration begins, water molecules are split.

The main role of dna in the  cell is the long-term storage of information. it is often compared to a blueprint, since it contains the instructions to construct other components of the  cell, such as  proteins  and rna molecules.the main function of rna is to carry information of amino acid sequence from the genes to where  proteins  are assembled on  ribosomes  in the  cytoplasm. mark brainliest, my work is good.