Bacteria and Viruses

Bacteria and Viruses

Multiple Choice

Unlike the cells of eukaryotes, the cells of bacteria do not have

• a nucleus
• cell walls
• flagellum
• cells

Multiple Choice

All bacteria are harmful.

• True
• False

Multiple Choice

Which of the following can be helpful in treating bacterial diseases but NOT viral diseases?

• vaccines
• antibiotics
• antiviral drugs
• aspirin

Multiple Choice

Antibiotics kill viruses

• True
• False

Multiple Choice

When antibiotics were first developed, most infectious diseases could be controlled by them. Today, certain bacteria are resistant to many antibiotics. One possible explanation for this change is that

• the antibiotics killed most of the bacteria that did not have a genetic variation for resistance
• the bacteria needed to change in order to produce more antibiotics
• some of the bacteria learned how to resist the antibiotics
• antibiotics have become weaker over the years

Multiple Choice

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

• host cell
• bacteria
• virus
• pathogen

Multiple Choice

Living cell in which a virus can actively multiply.

• host cell
• microbe
• infection
• fungi

Multiple Choice

Reasons that viruses are considered to be nonliving is because

• They are not cellular
• They cannot reproduce on their own
• They cannot make proteins
• all of the above

Multiple Choice

What is the first step of the virus reproduction cycle?

• The viruses genetic material (DNA) starts to take over the functions of the cell
• The host cell bursts open, releasing the new viruses
• The virus injects its genetic material into the cell
• A virus attaches to the surface of a host cell

Multiple Choice

When a virus invades a living cell, its _______
takes over the cell's functions.

• outer coat
• genetic material
• core
• cytoplasm

Multiple Choice

Which is the BEST way to help prevent the flu virus from becoming a pandemic?

• sleeping 8 hours a night
• taking antibiotics
• getting a vaccination
• eating fruits and vegetables

Multiple Choice

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

Multiple Choice

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