What are the two ends of DNA?

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Multiple Choice

What are the two ends of DNA?

Explanation:
DNA has directionality: its sugar-phosphate backbone is built from 5' to 3' as nucleotides connect from the 5' phosphate of one nucleotide to the 3' hydroxyl of the next. This creates a free 5' phosphate at one end and a free 3' hydroxyl at the other end. In a double-stranded molecule, each strand carries these ends, so the molecule has both a 5' end and a 3' end. Therefore, the two ends are the 5' end and the 3' end. The other options imply only one end or none, which isn’t accurate.

DNA has directionality: its sugar-phosphate backbone is built from 5' to 3' as nucleotides connect from the 5' phosphate of one nucleotide to the 3' hydroxyl of the next. This creates a free 5' phosphate at one end and a free 3' hydroxyl at the other end. In a double-stranded molecule, each strand carries these ends, so the molecule has both a 5' end and a 3' end. Therefore, the two ends are the 5' end and the 3' end. The other options imply only one end or none, which isn’t accurate.

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