dna structure

DNA helix is a secondary structure made up of 2 antiparallel, complementary, helical DNA chains wound around the same axis to create a right-handed double helix.

DNA helix is a secondary structure made up of 2 antiparallel, complementary, helical DNA chains wound around the same axis to create a right-handed double helix.

DNA has a hydrophilic backbone of alternating deoxyribose and phosphate groups outside of the helix.

DNA has a hydrophilic backbone of alternating deoxyribose and phosphate groups outside of the helix.

Purine and pyrimidine bases have a planar structure and are hydrophobically stacked inside the double helix perpendicular to the axis.

Purine and pyrimidine bases have a planar structure and are hydrophobically stacked inside the double helix perpendicular to the axis.

There is also a primary repeating unit every 3.4 A, secondary repeating unit every 34 A, and a diameter of 20 A.

There is also a primary repeating unit every 3.4 A, secondary repeating unit every 34 A, and a diameter of 20 A.

This structure is based on x-ray crystallography

This structure is based on x-ray crystallography

Two complementary strands run antiparallel by 5’-3’ phosphodiester linkages.

Two complementary strands run antiparallel by 5’-3’ phosphodiester linkages.

There are 3 hydrogen bonds between guanine and cytosine and 2 hydrogen bonds between Adenine and thymine

There are 3 hydrogen bonds between guanine and cytosine and 2 hydrogen bonds between Adenine and thymine