- A certain virus causes a disease of the digestive system. What is the most likely source of this virus?
Your answer:
Water
Insects
Air
Soil
- An important difference between viruses and living cells is that viruses--
Your answer:
cannot mutate but cells can
need an energy source but cells do not
cannot reproduce outside of cells
contain more nuclei than cells
- What structure is common to all five kingdoms of living organisms?
Your answer:
DNA
Nucleus
Cell wall
Mitochondria
- Long ago, people thought that the smallpox virus could be carried through the air. For this reason, many people moved from crowded cities to the more open country during smallpox epidemics, carrying with them family members who had the virus but had not yet contracted the disease. When the pox erupted on these family members, other members living in the home soon contracted the disease too. Which of these was then discovered to be the means of transmission?
Your answer:
Directly contacting a person with smallpox
Being bitten by mosquitos that carry the virus
Eating food that contains the virus
Drinking water from local wells
- Bacteria and viral particles often engage in a symbiotic relationship with other organisms in which one benefits while one organism is harmed. What is this relationship called?
Your answer:
commensalism
antagonism
parasitism
mutualism