<unk> <unk> <unk> <unk> <unk>  Passage: Some viruses (e.g. HIV and many animal viruses) have viral envelopes covering their protective protein capsids. <unk> Passage: Some viruses (e.g. HIV and many animal viruses) have viral envelopes covering their protective protein capsids. ️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️ <unk> <unk> <unk> Glycoproteins on the surface of the envelope serve to identify and bind to receptor sites on the host's membrane.<unk> Glycoproteins on the surface of the envelope serve to identify and bind to receptor sites on the host's membrane.<unk> Glycoproteins on the surface of the envelope serve to identify and bind to receptor sites on the host's membrane. ️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>  Question: Envelopes help which infectious agents?
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