The primary function of the hemagglutinin protein is to:

The primary function of the hemagglutinin protein is to:



A. Permit the release of viral progeny from the cell
B. Attach to sialic acid residues on the cell surface and promote engulfment
C. Transcribe the viral RNA
D. Prevent attachment to red blood cells


Answer: B. Attach to sialic acid residues on the cell surface and promote engulfment


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