Problem
A. In 1948, before the structure of DNA was discovered, Erwin Chargaff discovered that DNA in living cells contains equal amounts of purines and pyrimidines. He also discovered that the proportion of adenine is equal to the proportion of thymine, and the proportion of guanine is equal to the proportion of cytosine. Based on what you know about the structure of double-stranded DNA, why do these discoveries make sense?
B. Briefly explain how the primary structure and secondary structure of DNA allow it to fulfill its role as a genetic molecule.
C. Briefly explain how the tertiary structural properties of DNA allows it to fit inside living cells.
D. The figure below depicts a cell with a pair of homologous chromosomes in G, of interphase before mitosis. Centromeres are depicted as black dots, and the nuclear envelope is depicted as a dotted circle.