7. When a sudden change in the environment, such as a flood or a fire, reduces the size of a population, the survivors’ collective gene pool becomes only a limited representation of what was present before the disaster.  This phenomenon is called:

29. What is autoimmunity?  Give an example one autoimmune disease and what happens to form the disease.

48. Choose the correct order of the steps of the scientific method.

12. The viral______________plays a role in attaching a virion to the host cell.

24. Explain the three patterns of natural selection and how they affect of the evolution of traits.  Give an example of each.

22. Describe the relationship between mutation, evolution, and natural selection.  Do these terms apply to individuals or populations?

26. Why is the immune response much faster after reinfection than after the initial infection?

15. Foreign particles circulating in the blood are filtered by the   

13. Which of the following is a barrier against pathogens provided by the skin?

55. Write the balanced equation for photosynthesis.