The nucleotide
bases are adenine (A), guanine (G), cytosine (C), thymine (T), and uracil (U).
The bases combine with sugar to make them adenosine, guanosine, cytidine, thymidine, and uridine
repectively.
The bases can
be arranged in many different combinations and the genes in their long chains
can have trillions of different combinations.
Many types of obstacles hinder biomedical scientists from solving health-related challenges. Money that is needed for researches is one of them and you must cooperate with funding agencies. For innovative work you must think outside the box. Also you need to spend too much time for "paperwork".
Answer:
Molecule is two or more atoms joined together