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DNA Beginning of Paper Deoxyribonucleic acid and ribonucleic acid are two chemical substances involved in transmitting genetic information from parent to offspring. It was known early into the 20th century that chromosomes, the genetic material of cells, contained . In 1944, Oswald T. Avery, Colin M. MacLe .... Middle of Paper .... of three things. The first is a sugar called deoxyribose. Attached to one end of the sugar is a phosphate group, and at the other is one of several nitrogenous bases. DNA contains four nitrogenous bases. The first two, adenine and guanine, are double-ringed purine compounds. The others, cytosine and thymine, are single-ringed pyrimidine compounds. (Miller, 141) Four types of DNA nucleotides can be formed, depending on which nitrogenous base is involved. The phosphate group of each nucleotide bonds with a carbon from the deoxyribose. This for .... 1416 words | 6 pages Subscription Length Price Join 30 days membership (recurring) $19.95 90 days membership (recurring) $39.95 180 days membership (non-recurring) $69.95