  The structure of the nucleon and the first radial excitation of the nucleon,
the Roper, $N(1440)$, is studied within the formalism of Light-Front
holography. The nucleon elastic form factors and $\gamma^\ast N \to N(1440)$
transition form factors are calculated under the assumption of the dominance of
the valence quark degrees of freedom. Contrary to the previous studies, the
bare parameters of the model associated with the valence quark are fixed by the
empirical data for large momentum transfer ($Q^2$) assuming that the
corrections to the three-quark picture (meson cloud contributions) are
suppressed. The $\gamma^\ast N \to N(1440)$ transition form factors are then
calculated without any adjustable parameters. Our estimates are compared with
results from models based on valence quarks and others. The model compares well
with the $\gamma^\ast N \to N(1440)$ transition form factor data, suggesting
that meson cloud effects are not large, except in the region $Q^2< 1.5$
GeV$^2$. In particular, the meson cloud contributions for the Pauli form factor
are small.
