Which term describes the DNA molecule's shape?

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Prepare for the Virginia 7th Grade Science SOL Test. Incorporate flashcards and multiple choice questions, each with hints and detailed explanations. Ensure your success on the exam!

Multiple Choice

Which term describes the DNA molecule's shape?

Explanation:
DNA’s shape is best described as a double helix—the two long strands of nucleotides twist around each other like a twisted ladder. Each strand has a sugar-phosphate backbone, and the bases pair between strands (A with T, G with C) to form the rungs. This two-strand, antiparallel arrangement creates a stable, compact structure that can be copied quickly during replication. A single strand describes RNA or denatured DNA, while a general helix or a spiral-staircase image doesn’t specify that two strands wind together. The double helix name captures that specific, two-stranded arrangement.

DNA’s shape is best described as a double helix—the two long strands of nucleotides twist around each other like a twisted ladder. Each strand has a sugar-phosphate backbone, and the bases pair between strands (A with T, G with C) to form the rungs. This two-strand, antiparallel arrangement creates a stable, compact structure that can be copied quickly during replication. A single strand describes RNA or denatured DNA, while a general helix or a spiral-staircase image doesn’t specify that two strands wind together. The double helix name captures that specific, two-stranded arrangement.

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