Answer: Both deoxyribonucleic acid (DNA) and ribonucleic acid (RNA) are made up of nucleotides which consist of three parts: 1  Nitrogenous Base. 2  Purines and pyrimidines are the two categories of nitrogenous bases.3  Pentose Sugar. 4  In DNA, the sugar is 2'-deoxyribose. 5  Phosphate Group. 6  A single phosphate group is PO 4 3- .nswer: Both deoxyribonucleic acid (DNA) and ribonucleic acid (RNA) are made up of nucleotides which consist of three parts: 1  Nitrogenous Base. 2  Purines and pyrimidines are the two categories of nitrogenous bases.
AT A GLANCE: In 1440, German inventor Johannes Gutenberg invented a printing press process that, with refinements and increased mechanization, remained the principal means of printing until the late 20th century.
The Story: Inventor of the printing press, Henne G nsfleisch zur Laden, commonly called Johannes Gutenberg, was born about 1400 and died in 1468 at Mainz, Germany. Gutenberg was the son of Friele (Friedrich) G nsfleisch and Else Wyrich.041 Bi Sheng in China invented movable clay type 1400 Johannes Gutenberg born in Mainz, Germany 1423 Europeans use xylography (art of engraving on wood, block printing) to produce books.