  The transport properties and electron states in cylinder nanowires of Dirac
and Weyl semimetals are studied paying special attention to the structure and
properties of the surface Fermi arcs. The latter make the electric charge and
current density distributions in nanowires strongly nonuniform as the majority
of the charge density is accumulated at the surface. It is found that a Weyl
semimetal wire also supports a magnetization current localized mainly at the
surface because of the Fermi arcs contribution. By using the Kubo linear
response approach, the direct current (DC) conductivity is calculated and it is
found that its spatial profile is nontrivial. By explicitly separating the
contributions of the surface and bulk states, it is shown that when the
electric chemical potential and/or the radius of the wire is small, the
electron transport is determined primarily by the Fermi arcs and the electrical
conductivity is much higher at the surface than in the bulk. Due to the rise of
the surface-bulk transition rate, the relative contribution of the surface
states to the total conductivity gradually diminishes as the chemical potential
increases. In addition, the DC conductivity at the surface demonstrates
noticeable peaks when the Fermi level crosses energies of the surface states.
