  Microscopical approach to a deuteron breakup at high and intermediate
energies is proposed. We show that the quark exchange effects, resulting from
the full asymmetry of the $6q$-deuteron wave function with respect to the pair
permutations of quark variables, strongly affect the proton momentum
distribution in the deuteron, as well as the polarization observables of
inclusive deuteron breakup, when the ``internal momentum'' in the deuteron is
of order of a few hundreds MeV/c.
