viruses/bacteria

What does a virus have on the inside?

• DNA, but never RNA
• RNA but never DNA
• DNA or RNA
• neither DNA or RNA

How could you describe the size of a virus?

• Smaller than bacteria
• Larger than a parasite
• About the size of a dime
• Smaller than a proton

A tiny, nonliving particle that invades and then reproduces inside a living cell.

• host cell
• bacteria
• virus
• pathogen

Living cell in which a virus can actively multiply.

• host cell
• microbe
• infection
• fungi

Which BEST compares bacteria and viruses?

• bacteria are smaller than viruses
• bacteria cause disease, but viruses do not
• bacteria are living organisms, but viruses are not
• bacteria have genetic material, but viruses do not

Why do doctors suggest that people get a flu vaccine each year?

• viruses replicate more rapidly over time
• viruses can mutate from year to year
• vaccines are absorbed by the body after a year
• vaccines get stronger over time

Why are viruses considered to be nonliving organism?

• they do not have genetic information
• they are not able to move on their own
• they do not interact with their environment
• they are not able to reproduce without a host cell

What does invading the host cell enable the virus to do?

• increase its size
• synthesize needed oxygen
• obtain nutrients
• reproduce

The proteins (spikes) in a virus act like...

• keys to enter the cell with a specific shape

• walls to protect against other viruses

• factories where more viruses are made

Scientists can use a weakened form of a virus to create a(n)...

• pathogen

• bacteria

• vaccine

• infection