Question

name the two molecules which alternative to make the side portions or backbone of a dna model

Answer 1

sugar molecules and phosphate

Answer 2

i think te two molecule are nitrogenous bases inwhich phosphate group runs in 5to 3 direction and 3to 5 direction with the carbon of deoxyribose sugar

Answer 3

u r rit but nitrogen bases is wrong word it means guanine etc ok use nitrogen compound