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Imagine a ladder, then twist it along it's length. Each side rail forms a helix (screw thread) shape. The alternating sugar-phosphate sequence are the side rails of the ladder the Purine and Pyrimidine Bases (A,G & C,T) are the rungs.

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15y ago
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15y ago

It refers to the DNA molecule that is shaped like a ''twisted ladder'' with the outsides (made of deoxyribose and phoshate) twisted.

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12y ago

DNA forms a double-helix shape - two strands twisting together.

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14y ago

two twisted around each other likea winding stair case. each stairs is made of nucleotides.

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12y ago

a double spirl stair case

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Q: DNA is a double helix shape what is the meaning?
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