+4.+Pretend+you+are+a+ribosome+lodged+in+the+rough+endoplasmic+reticulum+of+a+cell.+Your+job+is+to+translate+an+incoming+messenger+RNA+into+a+polypeptide+by+covalently+linking+3+amino+acids+with+peptide+bonds.+Using+the+same+amino+acids+as+above,+draw+a+polypeptide+containing+glycine,+arginine,+and+histidine,+covalently-linked+by+peptide+bonds.+This+is+an+example+of+a+dehydration+synthesis+reaction,+so+be+sure+to+include+the+newly+formed+water+molecules.