The DNA double helix looks like a twisted ladder. What makes up each rung of the ladder? What holds the rungs together at the sides?( rung- a horizontal support on a ladder )

Dear student,

The following diagram shows the double-helical structure of DNA :



The rung of the ladder of DNA double helical structure is formed by the different nitrogenous bases (A,G,T & G) which are held together by hydrogen bonds and are complementary to each other. The rungs are held together at the sides by the sugar-phosphate backbone.

Regards.

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