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.
Overview. Johannes Gutenberg's invention of the printing press is widely thought of as the origin of mass communication-- it marked Western culture's first viable method of disseminating ideas and information from a single source to a large and far-ranging audience.ntil the 19th century Gutenberg's print technology had not changed dramatically. In the early 1800's the development of continuous rolls of paper, a steam-powered press and a way to use iron instead of wood for building presses all added to the efficiency of printing.