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.
These combinations (A/T) and (G/C) are called base pairs. The two DNA strands are held together by interchain hydrogen bonds. H-bonds pair the bases in one chain to the complementary bases in the other chain. (A/T and G/C). slide 2 of 4. Hydrogen Bonds in DNA A number factors are responsible for the stability of the DNA double helix structure, among them hydrogen bonds. Internal and external hydrogen bonds stabilize the DNA molecule. The two strands of DNA stay together by H bonds that occur between complementary nucleotide base pairs. Two hydrogen bonds occur between the adenosine and the thymine base pairs, and between the cytosine and the guanine there are three. While each hydrogen bond is extremely weak (compared to a covalent bond for example), the millions of H-bonds together represent an extremely strong force that keeps the two DNA strands together.