No, iron is a metallic element and do not exists as molecules, macro molecules are those which contain thousands of atoms or molecules as a single unity as starch, proteins etc.
monosaccharides
oxygen
The large intestines, or colons to be specific, transport digested food molecules into the blood stream
dehydration synthesis
amino acid lipids
Nucleic acids.
moves things in and out of cells
Protein is digested to form amino acids. Lipids are digested to fatty acids. Carbohydrates are digested to glucose and other simple sugars.
oxygen
proteinslipidscarbohydrates
No. Being digested would mean the body falling apart into basically molecules. And that is not survivable.