Proteins can serve as which reduce the energy necessary or speed up a reaction. They can also serve as in the cell membrane or for oxygen in . They help to maintain , , , etc. Wordbank:
Oxygen, liquid, cellulose, insulation, polymers, hydrogen, chains, Carbon, bones, monomers, structure, Glycogen, dehydration synthesis, rings, Starch, hemoglobin, energy, Monosaccharides, polysaccharide, enzymes, cell membrane, tendons, Support, muscles, transporters