  Deep inelastic structure functions for the nucleon are obtained in a
constituent quark model on the light cone. In the Bjorken limit the parton
model is derived. Structure functions from the hadronic tensor at the scale
$\mu \sim 0.25$ GeV are evolved from (0.6 GeV$)^{2}$ to $-q^{2}\sim 15$
GeV$^{2}$. The model incorporates the quark boosts, is designed to describe
form factors and structure functions, and to provide a link between the parton
and constituent quark models. The main effect of the spin force between quarks
is described in terms of smaller (and lighter) scalar $u-d$ quark pairs in the
nucleon. To account for the negative slope of $F^{n}_{2}(x)/F^{p}_{2}(x)$,
attraction between scalar $u-d$ quark pairs and incorporation of boosts are
required. The two-body spin force between quarks from color magnetism also
leads to a negative slope. The polarization asymmetry $A^{p}_{1}$ is in fair
agreement with the EMC data in the valence quark region. Revised
hep-ph/9401342, Phys. Rev. D.
