Explain how and does its sequence change

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What do scientists mean when they describe a "single-stranded" versus a "double-stranded" molecule of DNA? Can DNA go back and forth between being double and single-stranded? If so, explain how, and does its sequence change?
Will DNA replication process always create identical strands? Why or why not? What would the consequence of a "mistake" be?

Reference no: EM131100229

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