The "spiral staircase" structure of DNA is referred to as the

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The "spiral staircase" structure of DNA is commonly referred to as the double helix, which is formed by two polynucleotide chains that are twisted around each other. Option A, tertiary structure, refers to the three-dimensional shape of a protein, not DNA. Option B, spiral structure, is too vague and does not specifically describe the unique structure of DNA. Option D, the twist of life, is not a commonly accepted term for the structure of DNA.

The "Spiral Staircase" Structure of DNA Is Referred to as the