Glycoprotein spikes protruding from the outer surface of viral envelopes function as

Glycoprotein spikes protruding from the outer surface of viral envelopes function as

Glycoprotein spikes protruding from the outer surface of viral envelopes function as 








A. toxins.
B. factors that bind to host cells.
C. cell lysis factors.
D. factors needed for site specific recombination.











Answer: B