Question

during which checkpoint would damaged or improperly replicated dna halt progression through the cell cycle?

Answer 1

When a cell's DNA is damaged, a sensor protein activates p53, which halts the cell cycle at the G 1start subscript, 1, end subscript checkpoint by triggering production of a cell-cycle inhibitor. This pause buys time for DNA repair, which also depends on p53, whose second job is to activate DNA repair enzymes.

Answer 2

G2/Growth 2 phase