<prompt> Virus lacking hemagglutinin and neuraminidase but having membrane fusion protein is ?RSVCMVHSVEBV  <response>: Ans. is a i.e., RSV RSV does not posses hemagglutinin or neuraminidase. . The viral envelope has two glycoproteins? i G protein -- By which virus attaches to cell surface ii F- protein Fusion protein --which bring about fusion between viral and host cell membranes. It is also responsible for cell to cell fusion, which leads to characteristic syncytial formation. 