What shape does DNA take? Circular Linear Double helix Sinale helix

## Step 1<br />The question asks about the shape of DNA. DNA, or deoxyribonucleic acid, is the molecule that carries the genetic instructions used in the growth, development, functioning, and reproduction of all known living organisms and many viruses.<br /><br />## Step 2<br />The structure of DNA is a double helix, which is a shape that resembles a twisted ladder. This structure was first described by James Watson and Francis Crick in 1953.<br /><br />## Step 3<br />The double helix structure of DNA is stabilized by hydrogen bonds between the nitrogenous bases of the two strands. These bases are adenine (A), thymine (T), cytosine (C), and guanine (G). Adenine pairs with thymine, and cytosine pairs with guanine.<br /><br />## Step 4<br />The other options provided, "Circular," "Linear," and "Sinale helix," do not accurately describe the structure of DNA. "Circular" and "Linear" refer to the shape of the DNA molecule in certain viruses and bacteria, but not in eukaryotic cells. "Sinale helix" is not a recognized term in biology.