  We calculate the electromagnetic and axial nuclear moments of the deuteron
and triton as a function of their radius using a relativistic two-nucleon and
three-nucleon model formulated on the light-cone. The results also provide an
estimate of the nuclear binding corrections to helicity-dependent deep
inelastic scattering sum rules. At large nucleon radius, the moments are given
by the usual non-relativistic formulae modified by finite binding effects. At
small radius, the moments take the canonical values given by the generalization
of the Drell-Hearn-Gerasimov sum rule. In addition, as R-->0, the constituent
helicities become completely disoriented, and the Gamow-Teller matrix element
vanishes. Thus, in the pointlike limit MR-->0, the moments of a spin-one bound
states coincide with the canonical couplings of elementary spin-one bosons of
the Standard Model, mu=e/M, Q=-e/M^2, and g_A=0.
