What do monosaccharides provide for cells?

They are building blocks for larger polysaccharide which are important in structural rigidity of cells.

Polysaccharides such as Starch and Cellulose which are instrumental in cell structure and rigidity are formed from chains of monosaccharides.

They are also useful in the provision of energy which is used in cell functions (metabolism).

Monosaccharides such as Glucose, Sucrose are useful in provision of energy for physical and metabolic activities of the body.

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the generally accepted parts of modern cell theory include: all known living things are made up of one or more cells. all living cells arise from pre-existing cells by division. the cell is the fundamental unit of structure and function in all living organisms.