its is a DOUBLE HELIX of PAIRED BASES
a molecule of dna contains two strands held together by CHEMICALS called bases
the four different bases include;
they are always paired and in the same way e.g A-T G-C by a weak HYDROGEN BOND.
How the structure of DNA was discovered
the 4 scientists involved;
Franklin and Wilkins discovered the HELIX shape by directing beams on to CRYSTALLISED DNA and looking at…