1. Micro Life Notes

2. Notes – Activity 30 1. Diseases can be caused by infectious agents, genes, environmental factors, lifestyle or a combination of these causes.

3. Notes – Activity 30 2. Infectious diseases can spread rapidly through a population. 3. Data can be analyzed to determine trends and/or patterns.

4. Notes – Activity 31 4. Disease is a breakdown in the structure or function of a living organism.

5. Notes – Activity 32 5. A hypothesis is an explanation based on observed facts or an idea of how things work. New information may lead to a revision of a hypothesis.

6. Notes – Activity 32 6. Analyzing trends in how a disease spreads can suggest ways of preventing its further spread.

7. Notes- Activity 32 7. Epidemiologists track patterns of disease transmission in order to develop procedures to reduce the spread of disease.

8. Notes – Activity 32 8. A carrier of a disease shows NO symptoms of the disease but can give (transmit) it to others.

9. Notes – Activity 32 Person Symptoms Disease Infected Carrier Not Infected

10. Notes – Activity 33 10.Society sometimes responds to people with infectious diseases with fear, prejudice or cruelty.

11. Notes – Activity 33 11. More complete knowledge of disease transmission has led to improved public health measures.

12. Notes – Activity 33 12. Vectors are one way in which some infectious diseases are spread to humans.

13. Notes – Activity 34 13. Making decisions about complex issues often involves trade offs (giving up one thing in favor of another).

14. Notes – Activity 34 14. Hansen’s disease is one of the many diseases that have become rare in the United States due to the availability of effective drug treatments.

15. Notes – Activity 35 15. Always carry a microscope using two hands, one under the base and one on the arm.

16. Notes – Activity 35 16. Rotate the objectives carefully. Do not allow them to touch the stage or anything placed on the stage, such as the slide. This can damage the microscope.

17. Notes – Activity 35 17.When using the coarse focus knob, turn so the body tube moves up SLOWLY!

18. Notes – Activity 35 18. Use only lens paper to clean the eyepiece and objectives. 19. When you have finished using the microscope, remember to turn off the light and set the objectives back to low power (4x).

19. Notes – Activity 35 20. The microscope can be used as a tool for investigation. 21. Microscopes reveal organisms that cannot be seen with the naked eye.

20. Notes – Activity 36 22.Most infectious diseases are caused by microbes. 23. Life is composed of a variety of organisms that vary greatly in size.

21. Notes – Activity 38 24. Cells of different organisms have some similar structures, such as the cell membrane. Other structures vary among cells.

22. Notes – Activity 38 25. Viewing structures within the cell, like the nucleus, can be made easier by staining.

23. Notes – Activity 39 26. Cells are alive. The function of living organisms, including respiration, are performed by cells.

24. Notes – Activity 39 27. All living things are composed of microscopic units called cells.

25. Notes – Activity 40 28. The function of the cell membrane is to control what can enter or leave the cell. Cell membranes are selective; some particles pass through but others can not.

26. Notes – Activity 41 29. Creating models is one way to understand and communicate scientific information.

27. Notes – Activity 41 30. The small size of cells increases the rate at which particles can cross the cell membrane.

28. Notes - Activity 42 31. The cell membrane separates cytoplasm from its external (outside) environment. 32. The nuclear membrane protects the genetic material in the nucleus.

29. Notes – Activity 43 33. Protists and bacteria are single-celled microbes.

30. Notes – Activity 43 34. Characteristics that distinguish organisms include size, shape and structure.

31. Notes – Activity 43 35. Differences between protists and bacteria include the presence or absence of a nucleus and size.

32. Notes – Activity 44 36. The category of “microbes” includes microorganisms, such as bacteria and protists, and also viruses, which are not considered to be alive.

33. Notes – Activity 44 37. Differences between protists, bacteria, and viruses include whether they are cells, the presence or absence of a nucleus and size.