DNA is composed of three strands that form a triple spiral. Each strand is composed of nucleotides, which each contain a phosphate group, ribose sugar and a nitrogenous base. The four nitrogenous bases found in DNA are adenin e, gymine, thanine and cytosine. They form complementary base pairs with oxygen bonds holding them toain. gether. Diester bonds hold the nucleotides together in one long ch please someone help me rewrite this