A-level Biology Notes

properties of DNA structure?

-double stranded= makes DNA more stable & 2 strands act as templates in semi-conservative replication

-coil into helix=more compact

-sugar-phosphate backbone= protects bases (bases code for proteins)

- hydrogen bonds between bases= weak, so double strand separates more easily for semi-conservative replication

-complementary base pairing= ensures identical copies of DNA made by semi- conservative replication.