DNA structure

DNA in chromosomes


DNA structure


components of DNA

double stranded DNA has two strands

A phosphate-deoxyribose polymer composes the backbone of the DNA

adjacent sugars are connected by phosphodiester bonds

nitrogenous bases are convalently bonded to the 1' carbon of the deoxyribose

the two DNA strands are antiparallel

the two strands are held together by hydrogen bonds between complementary bases

adenine hydrogen bonds (base pairs) to thymine

guanine hydrogen bonds to cytosine

When DNA replicates two idential DNA double helices are formed

sister chromatids