  The isosinglet unpolarized and isovector polarized twist-2 quark
distributions of the nucleon at low normalization point are calculated in the
large-Nc limit. The nucleon is described as a soliton of the effective chiral
theory. We derive the expressions for the distribution functions in the
large-Nc limit starting from their definition as numbers of partons carrying
momentum fraction x in the infinite momentum frame. We develop a numerical
method for computation of the quark and antiquark distributions as sums over
the quark single-particle levels in the pion field of the soliton. The
contributions of the discrete bound-state level as well as the Dirac continuum
are taken into account. The quark- and antiquark distributions obtained
explicitly satisfy all general requirements. Results are in reasonable
agreement with parametrizations of the data at low normalization point.
