They are extremely large molecules formed by the linking up of smaller molecules.
unusable in original form - broken down into basic units using chemical and physical digestion - absorbed into blood cells - assimilation (cells use monomers to re-build polymers).
physical digestion- large particles get broken down into smaller particles (chewing, churning of the stomach).
A monomer unit is chemically bonded to molecules to make a polymer.
polymers in food e.g. starch and glycogen- made from carbohydrate monomers.
proteins- also monomers- made from amino acid monomers.