Final answer:
The deacetylated N-terminal tails of histone 3 and 4 bind more tightly to DNA.
Step-by-step explanation:
Histones H3 and H4 have N-terminal tails that can be modified by different chemical groups.
When the tails of histones H3 and H4 are deacetylated, they become positively charged, leading to tighter binding with the negatively charged DNA molecules.
Therefore, when the N-terminal tails of histones H3 and H4 are deacetylated, they bind more tightly to the DNA.