Which part of the cell functions as a system boundary?

What element is able to combine with itself and hydrogen to form large molecules ?

Monomers are the building blocks of larger molecules, called polymers. for example, proteins are composed of chains of amino acids that are linked together. cellulose is a polymer that makes up plant cell walls. cellulose is made from a chain of c6h10o5 molecules. which monomers are most likely used to produce cellulose? why?

What goes in and out of a cell respiration?