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(D) The genetic code was deciphered in the $1960$s by scientists including $Crick$, $Ochoa$, $Nirenberg$, $Mathaei$, and $Khorana$. Specifically, Mars

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Nirenberg and Mathaei

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(D) The genetic code was deciphered in the $1960$s by scientists including $Crick$, $Ochoa$, $Nirenberg$, $Mathaei$, and $Khorana$. Specifically, Marshall $Nirenberg$ and $Heinrich$ $Mathaei$ performed the cell-free protein synthesis experiment using synthetic $RNA$ (poly-$U$), which provided the first evidence that a sequence of three nucleotides (a triplet) codes for a specific amino acid (phenylalanine). This discovery unequivocally established the triplet nature of the genetic code.

Whose experiments cracked the $DNA$ and discovered unequivocally that a genetic code is a "triplet"?

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