  We discuss a hybrid model of the proton and neutron inelastic structure
functions which incorporates both the partonic and the nucleon resonance
structures and applicable in a wide region of the invariant mass $W$ of
produced hadronic states. Focusing at the typical kinematics of JLab
experiments we compute the deuteron structure functions and demonstrate good
performance of the model against data. We perform systematic study of the
ratios $F_2^n/F_2^d$ and $(F_2^p+F_2^n)/F_2^d$ for both, the deep-inelastic and
the resonance, region in the context of recent measurements of BoNuS experiment
at Jefferson Lab.
