Practice Questions

Tobacco Mosaic Virus causes mosaic-like discoloration on tobacco and several other plant leaves, reducing crop yield.

Bacteriophages specifically infect bacterial cells by attaching to receptors on the bacterial cell wall.

Rabies virus has a bullet-shaped appearance but internally possesses a helical nucleocapsid.

Adenovirus is a classic example of a naked virus with an icosahedral capsid, making it highly resistant to environmental conditions.

Adenoviruses possess a linear double-stranded DNA genome enclosed in an icosahedral capsid.

Influenza virus infects humans, birds, and several mammals, therefore it belongs to the animal viruses.

Lipid envelopes are easily disrupted by heat, drying, soaps, and detergents, making enveloped viruses less stable outside the host.

Human Immunodeficiency Virus (HIV) is a retrovirus containing single-stranded RNA and the enzyme reverse transcriptase.

Positive-sense ssRNA viruses can be translated immediately by host ribosomes upon entering the host cell.

Hepatitis B virus is a partially double-stranded DNA virus belonging to the Hepadnaviridae family. It replicates through reverse transcription but is classified as a DNA virus.