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DNA wasn't discovered in 1953. It was discovered in, depending on exactly what you count as "discovery", either 1869 or 1878.

What happened in 1953 was that James Watson and Francis Crick (there's a good possibility that Rosalind Franklin may have done more than she got credit for, also) described the actual three-dimensional "double-helix" structure. Frankly, I wouldn't describe this as very important at all compared to, say, the growing realization from the late 1920s to the early 1950s that DNA was the carrier of the genetic code, so you should probably look through your textbook for clues as to what the author felt was "so important" about it.

DNA was discovered much earlier. in 1953 Watson & Crick proposed a double helical structure for it to explain the mechanism of replication and trascription etc.

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