41. Elimination of specific hydroxyl groups on the glucopyranose moiety does not completely eliminate catalysis. 42. Yeast tRNA kinase then phosphorylates the 5'- hydroxyl group using adenosine triphosphate. 43. Cross-linking guar polymer chains prevents aggregation by forming metal hydroxyl complexes. 44. Wood contains an abundance of chemical groups called " free hydroxyls ". 45. Chondroitin sulfate chains are linked to hydroxyl groups on serine residues of certain proteins. 46. Acetic anhydride is commonly used as an acetylating agent reacting with free hydroxyl groups. 47. Its molecular structure consists of a single carbon atom bonded to four hydroxyl groups. 48. The first and third hydroxyls point the opposite way from the second and fourth. 49. Both types of megamaser were found in galaxies in which hydroxyl had been detected. 50. Step 2 : nucleophilic attack of activated substrate hydroxyl on ATP ?-phosphate.
