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What are the main structural features of an RNA double-helix?

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Final answer:

The main structural features of an RNA double-helix are similar to those of DNA, but with some important differences. RNA is single-stranded and shows extensive intramolecular base pairing, creating a predictable three-dimensional structure.

Step-by-step explanation:

The main structural features of an RNA double-helix are similar to those of DNA, but with some important differences. RNA also has a double helix structure, where the sugar-phosphate backbone of the RNA molecule forms the outer part of the helix, and the nitrogenous bases are stacked inside. However, unlike DNA, RNA is typically single-stranded and shows extensive intramolecular base pairing between complementary sequences, creating a predictable three-dimensional structure essential for its function

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