Like DNA strands are the building blocks of life, they are composed of two strands that are COILED, PAIRED, and HELICAL. The first solution, 'COILED, ' is a 6 letter word that describes the shape of the DNA strands, which are wound around each other like a spiral staircase. The second solution, 'PAIRED, ' is also a 6 letter word that refers to the two strands of DNA that are connected together. The third solution, 'HELICAL, ' is a 7 letter word that describes the structure of the DNA strands, which are arranged in a helix-like shape. Together, these three solutions describe the structure of DNA strands, which are essential for life.