Every year, painted lady butterflies make huge migrations from Africa to Europe and back again. They also do this in North America, from Mexico to northern United States and Canada and back again. The migrations can be up to 15000 km long.ggs of the Painted Lady appear to be pale green in color. Caterpillars are grayish brown and darker at the ends. They have a yellow stripe running down the back of their body, and spikes along the back and sides of their body. Pupae can be a variety of colors including a metallic green, brown, or bluish-white.
The Helical Structure of DNA shows a single strand of DNA. However, as stated earlier, DNA exists as a double-helix, meaning two strands of DNA bind together. Figure %: Double-helical DNA As seen above, one strand is oriented in the 5' to 3' direction while the complementary strand runs in the 3' to 5' direction.
See Fig. 1. The nucleotides within each strand are held together by the phosphodiester bonds between the 5' carbon of one nucleotide and the 3 ' carbon of the adjacent nucleotdie. These strong covalent bonds form the the glue that holds the sugar/phosphate backbone together and thus act to keep each strand together.The two strands of DNA are held together by weak hydrogen bonds (remember, something must hold them together!) between the nitrogenous bases.The interesting (and very important) aspect of the Watson-Crick model is that these hydrogen bonds are base specific.he two strands of DNA are held together by weak hydrogen bonds (remember, something must hold them together!) between the nitrogenous bases. The interesting (and very important) aspect of the Watson-Crick model is that these hydrogen bonds are base specific.