REVIEW

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.
  

Which pair correctly matches a vector and the infectious disease it carries? 

• human – influenza
  
• opossum – rabies
  
• mosquito – malaria
• flea – Lyme disease
  

Which environmental conditions contribute most to the spread of bacteria?

• cold temperatures and low humidity
  
• warm temperatures and low humidity
  
• cold temperatures and high humidity
  
• warm temperatures and high humidity
  

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

• A virus becomes living when in contact with a host organism.
• A virus infects a host organism by injecting its DNA into the cells of the host organism.
• A virus infects a host organism by pulling the DNA from the cells of the host organism into itself. 
•  A virus becomes living when a sufficient number of viruses invade a host organism and cause an infection.

Which disease can be transmitted by casual contact between two individuals?

• influenza
• malaria
• kidney disease
• Lyme disease

Which is the best way to prevent the spread of pathogens?

• Wear gloves while outside.
• Educate the public about disease transmission.
• Wash hands frequently with antibacterial soap.
• Stay at home during flu season whenever possible.
  

Which is most often used to destroy bacteria?

• fungus
• vitamin
• vaccine
• antibiotic

Why do some antibiotics become ineffective over time?

• because they only kill certain viruses
• because they mutate before being used
• because they are overused for treatments
• because they only work for a few hours a day
  

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.
  

Ten people became sick with the flu after attending a school dance. What is the scenario that could best explain how the people got sick?

• contact with environmental sources
  
• contact with an infected animal
  
• contact with a contaminated object
  
• contact with an infected person