Exam 23: Viruses, Viroids, and Prions: Infectious Biological Particles

What type of molecule are viroids composed of?

Viruses are too small to carry any enzymes of their own.

Which equation best describes the composition of the simplest type of viral particle?

What is the viral DNA that is integrated into a bacterial host chromosome called?

Influenza is caused by a DNA virus.

-In the figure, which virus is illustrated?

What is the protein layer surrounding the viral genome called?

Evidence suggests that viruses evolved only after the evolution of cells.

Viroids consist of only RNA molecules.

Why are viruses considered nonliving?

Why are viral infections so much more difficult to treat than bacterial infections?

Which term best describes the biological nature of a virus?

Viral infections in plants are spread from cell to cell via plasmodesmata.

-Which term best describes the shape of the virus in the figure?

-In the figure, which number identifies the structure that binds to the host cell?

-In the figure, which number identifies the head?

BSE is caused by an infections protein molecule.

Some viruses can cause cancer.

Who is credited with the discovery of prions as a new biological principle of infection?

What adaptation helped the strain of influenza responsible for the pandemic of 1918 to be such an effective infectious agent?