Which histones form the histone octamer in eukaryotic chromatin?
H1, H2A, H2B, H3
H2A, H2B, H3, H4
H2B, H3, H4, H1
H3, H4, H2A, H2B
Core histones are H2A, H2B, H3, and H4, where two H3/H4 dimers (H3 and H4 bound together) and two H2A/H2B dimers (these two bound together) form the histone octamer.
Option 2 is the correct answer.