stars and stripes 2 italics the national anthem of the united states of america based on a poem written by francis scott key on september 14 1814 and set by him to the melody of the english song to anacreon in heaven officially adopted by the u s congress in 1931 examples from the web for star spangled banner expand
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.
The monomers of both DNA and RNA are composed of three parts: a phosphate group, a pentose (5-carbon sugar), and a nitrogenous base. Both DNA and RNA use a form of ribose as their sugar (RNA uses ribose itself; in DNA, a single oxygen atom has been removed from the 2' carbon of ribose, to form deoxyribose).Both DNA and RNA use the bases adenine, cytosine, and guanine.Both DNA and RNA undergo complementary base pairing (DNA usually between two different strands, and RNA usually between two regions of a single strand). Both DNA and RNA are synthesized in the 5' to 3' direction.oth DNA and RNA use the bases adenine, cytosine, and guanine. Both DNA and RNA undergo complementary base pairing (DNA usually between two different strands, and RNA usually between two regions of a single strand).