The dynamic structure factor S (k, ω) for an infinitely long single polymer chain is calculated from the Vlasov equation. The procedure is analogous to that of Nelkin and Ranganathan for a classical fluid. The polymer density is, however, non-uniform; the monomer density is assumed to be Gaussian about the center of mass. In analogy with classical fluids, the effective pair interaction between monomers in the chain not directly bonded is considered to be −k B TC(r), where C(r) is the direct correlation function. The numerical computation is carried out for a pearl-necklace model having 20 000 monomers and radius of gyration 500 A. The results are compared with those obtained for a classical fluid at the same density.