The first Born approximation is used to calculate all 16 Mueller scattering matrix elements for a single, continuous helix at any orientation with respect to the incoming light. The results are compared to those from a helix characterized by point-polarizable subunits using the Born approximation and the coupled-dipole approximation. The number of point-polarizable groups necessary to describe the helix is investigated by comparing the calculations using the continuous helix to those using the helix made of discrete subunits. It is found that for large helices, many subunits are necessary, so in these cases, the continuous model may be more applicable. Conditions for the necessity of including dipolar interactions are established as a function of the dielectric constant of the material.