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.
Nucleotide incorporation is determined by base pairing with the template strand of the DNA. The template is the DNA strand, also called the sense strand, that is copied by the RNA polymerase into a complementary strand of RNA called the transcript. The DNA strand that is not copied is know as the antisense strand.