Viruses

HIV attacks helper T lymphocytes and causes Acquired Immunodeficiency Syndrome (AIDS).

Rabies virus affects the nervous system and commonly causes hydrophobia in infected individuals.

Viruses infect cells possessing specific receptors complementary to viral attachment proteins.

Viral envelopes are obtained from host cell membranes during viral budding.

Poliovirus belongs to the RNA viruses and contains positive-sense single-stranded RNA.

Viruses depend entirely on host cellular machinery for replication.

TMV exhibits a rigid rod-shaped helical symmetry.

Influenza virus contains a segmented RNA genome.