The rungs or steps of DNA are made up of nitrogenous bases , which are attached to the sides or railings of DNA, which are made up of deoxyribose and phosphate.
Step-by-step explanation:
A ladder can be compared with the DNA structure.In a DNA structure the sides of the ladder consists of chemical phosphate and sugar backbone alternatively. The sugar that comprises the backbone of a DNA is also termed as Deoxyribose. Adenine (A), thymine (T), cytosine (C), and guanine (G). are the four nitrogenous bases that fills the two sides of the sugar-phosphate backbone. These group of sugar, phosphate and nitrogenous base forms a nucleotide which is a sub unit of a DNA.
The ‘rungs’ of the ladder are formed by these bases and they are attached to backbone of DNA where deoxyribose or sugar molecules are present. Hydrogen bonds connects these chemical bases and the type of these arrangements plays a major role in the determination of the type of the organism that is being formed.