【简答题】The major use of ammonia is not for the production of nitrogen containing chemicals for further industry use, but for fertilizers such as urea or ammonium nitrates and phosphates. Fertilizers consume ...
【单选题】A nucleotide has three characteristic components: (1) a nitrogenous (nitrogen-containing) base, (2) a pentose, and (3) one or more phosphates. The molecule without a phosphate group is called a ______...