  We obtain the electromagnetic form factors, the axial form factor, and the
parton distribution functions of the proton from the eigenstates of a
light-front effective Hamiltonian in the leading Fock representation suitable
for low-momentum scale applications. The electromagnetic and the axial form
factors are found to be in agreement with the available experimental data. The
unpolarized, the helicity, and the transversity valence quark distributions,
after QCD evolution, are consistent with the global QCD analyses. The tensor
charge also agree the experimental data, while the axial charge is somewhat
outside the experimental error bar.
