Viruses

What is the optimum temperature range for viruses to function?

• 0-10°C
• 4-37°C
• 38-50°C
• 60-100°C

What is the pH level at which most viruses tend to function optimally?

• 3 (acidic)
• 5 (slightly acidic)
• 7 (neutral)
• 9 (alkaline)

On which type of surface can viruses survive longer?

• Rough surfaces like paper
• Rough surfaces like fabric
• Smooth surfaces like plastic
• Smooth surfaces like metal

What do viruses require to replicate?

• Warm temperatures
• A host cell
• High humidity
• Direct sunlight

Which of the following could be used to argue that a virus is a living thing?

• They contain genetic material

• They respire

• They can move by themselves

• They excrete wastes

What type of genetic material do viruses contain?

• Only DNA
• Only RNA
• Either DNA or RNA
• Both DNA and RNA

What role do spike proteins play in a virus?

• They help viruses reproduce independently.
• They provide energy to the virus.
• They help viruses attach to and enter host cells.
• They break down the virus envelope.

What happens during the fusion stage of virus replication?

• The virus breaks down.
• The virus enters the host cell.
• The virus assembles its components.
• The virus releases its genetic material into the environment.

What is viral load?

• The number of viruses a person is exposed to.
• The amount of virus in a person's blood or body fluids.
• The time it takes for symptoms to appear.
• The ability of the virus to infect a new host.

During which period can a person spread a virus?

• Before symptoms appear
• Only after symptoms appear
• Only during the recovery period
• After symptoms have fully disappeared