Why it is in the news
Two recent papers, in Science and Cell, have described a bacterial anti-virus system, DRT3, in which one enzyme — DRT3b — writes a defined DNA sequence (a CACACA… repeat) without any nucleic-acid template, the protein itself dictating the order of nucleotides. Accompanying commentaries asked whether this breaches Francis Crick's central dogma of molecular biology; the consensus reading is that it stretches but does not overturn it.
The exam angle
Thesis: Scientific 'laws' in biology are generalisations that hold until nature offers an exception; the DRT3b finding refines rather than refutes the central dogma, showing how precise definitions protect a theory's explanatory power.