The sympathetic nervous systemâs fight-or-flight response is your built-in mechanism for safely escaping a life-threatening emergency, such as a lion lurking behind a bush.
The basic building block of DNA is called a NUCLEOTIDE. A nucleotide is made up of one sugar molecule, one phosphate molecule and one of the four bases. Here is the structural formula for the four nucleotides of DNA. Note that the purine bases (adenine and guanine) have a double ring structure while the pyrimidine bases (thymine and cytosine) have only a single ring.
The sugar phosphate backbone is an important stuctural component of  DNA. It consists of 5-carbon deoxyribose sugars and phosphate  groups. These sugars are linked together â¦ by a phosphodiester bond,  between carbon 4 of their chain, and a CH2 group that is attached  to a phosphate ion.1 person found this useful.NA is made up of a base (adenine, thymine, cytosine and guanine), a phosphate and a deoxyribose Sugar. The phosphate and the sugar form the backbone whi â¦ le the bases form the links in between. 1 person found this useful.