MCQs

Icosahedral symmetry provides stability and efficient genome packaging.

Reverse transcriptase converts viral RNA into DNA inside the host cell.

Retroviruses carry RNA and use reverse transcriptase to synthesize DNA.

Adsorption is the initial binding of a virus to specific host receptors.

T4 bacteriophage possesses an icosahedral head and tail apparatus.

RNA polymerases lack proofreading ability, leading to frequent mutations.

Poxviruses possess a complex brick-shaped structure unlike simple helical or icosahedral forms.

Plant viruses often enter through injuries and are spread by insect vectors.

Capsomeres are repeating protein units that assemble into the viral capsid.

Hepatitis B virus is a DNA virus and an important human pathogen.

Tail fibers recognize and bind specific bacterial receptors.

Influenza virus contains a segmented RNA genome.

TMV exhibits a rigid rod-shaped helical symmetry.

Viruses depend entirely on host cellular machinery for replication.

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

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

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

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

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