Assignment #21b: Microbes and Disease Causing Agents Quiz

Which best compares bacteria and viruses?

• Bacteria are living organisms, but viruses are not.

• Bacteria have genetic material, but viruses do not.

  
  

• Bacteria cause disease but viruses do not.

• Bacteria are smaller than viruses.

Why are viruses considered to be nonliving organisms?

• They are not able to move on their own

• They are not able to reproduce without a host cell

• They do not interact with their environment

• They do not have genetic information

What is the MOST effective defense against the chicken pox virus?

• vaccine

• antibiotics

• exercise

• diet

The bacteria that causes bubonic plague is transmitted to humans by fleas. Which term best describes the role of the fleas in transmitting bubonic plague?

• decomposer

• pathogen

• vector

• parasite

Humans occasionally become infected with common colds and flu after flying on crowded airplanes. Which microscopic biological hazard is most likely responsible?

• vector-borne parasites

  
  

• environmental mutagens

• food-borne bacteria

• airborne contagions

Antibiotics would be least useful against which type of disease-causing organism?

• bacteria

• fungus

  
  

• parasite

• virus

Health department officials are trying to identify the source of an outbreak of an intestinal virus. Which is the most likely source of the virus?

• lack of exercise

• contaminated water

• poor nutritional habits

• polluted air

Which is true regarding bacterial and viral infections?

• Bacterial infections are treated with antibiotics, while viral infections can be prevented through use of vaccines.

• Both viral infections and bacterial infections are treated with vaccines.

• Viral infections are treated with vaccines, while bacterial infections are prevented through use of antibiotics.

• Viral infections are treated with antibiotics, while bacterial infections are treated with vaccines.

Which best explains how a nonliving virus is able to reproduce?

• A virus becomes living when in contact with a host organism.

• A virus becomes living when a sufficient number of viruses invade a host organism and cause an infection.

• A virus infects a host organism by pulling the DNA from the cells of the host organism into itself.

  
  

• A virus infects a host organism by injecting its DNA into the cells of the host organism.

A tapeworm lives in the intestines of its host. Which example best describes the relationship between the tapeworm and its host?

• The tapeworm benefits from its host; however, the host is not affected.

• The tapeworm benefits from its host, and the host is negatively affected.

• The tapeworm does not benefit from its host, but the host does benefit.