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When was the nucleotide sequence of a viral genome first elucidated?

When was the nucleotide sequence of a viral genome first elucidated? Correct Answer 1977

The first nucleotide sequence of an entire viral genome X174 was sequenced in vitro in the year 1977. The nucleotide sequence contained 5375 nucleotides. Frederick Sanger was the first person to sequence a polypeptide.

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