All plant and animal cells produce enzymes, made from protein molecules (long chains of amino acids held
together by peptide bonds).
These beads are connected
together by peptide bonds.
These subunits are linked
together by peptide bonds to form chains that can be straight lines, or branched like the sub-branches on a tree.
Glutathione, you see, is called a tripeptide because he's composed of three amino acids, each bound
together by a peptide bond that magnesium and ATP have infused with energy.