Micro Life

Notes

Notes – Activity 30

• 1. Diseases can be caused by infectious agents, genes, environmental factors, lifestyle or a combination of these causes.

Notes – Activity 30

• 2. Infectious diseases can spread rapidly through a population.

• 3. Data can be analyzed to determine trends and/or patterns.

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• 4. Disease is a breakdown in the structure or function of a living organism.

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• 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.

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• 6. Analyzing trends in how a disease spreads can suggest ways of preventing its further spread.

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• 7. Epidemiologists track patterns of disease transmission in order to develop procedures to reduce the spread of disease.

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

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• Person Symptoms Disease

• Infected

• Carrier

• Not Infected

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10.Society sometimes responds to people with infectious diseases with fear, prejudice or cruelty.

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• 11. More complete knowledge of disease transmission has led to improved public health measures.

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• 12. Vectors are one way in which some infectious disease are spread to humans.

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

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• 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.

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• 15. Always carry a microscope using two hands, one under the base and one on the arm.

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.

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

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• 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).

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• 20. The microscope can be used as a tool for investigation.

• 21. Microscopes reveal organisms that cannot be seen with the naked eye.

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22.Most infectious diseases are caused by microbes.

23. Life is composed of a variety of organisms that vary greatly in size.

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• 24. Cells of different organisms have some similar structures, such as the cell membrane. Other structures vary among cells.

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• 25. Viewing structures within the cell, like the nucleus, can be made easier by staining.

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• 26. Cells are alive. The function of living organisms, including respiration, are performed by cells.

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• 27. All living things are composed of microscopic units called cells.

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• 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.

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• 29. Creating models is one way to understand and communicate scientific information.

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• 30. The small size of cells increases the rate at which particles can cross the cell membrane.

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.

Notes – Activity 43• 33. Protists and bacteria are

single-celled microbes.

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• 34. Characteristics that distinguish organisms include size, shape and structure.

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• 35. Differences between protists and bacteria include the presence or absence of a nucleus and size.

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

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• 37. Differences between protists , bacteria, and viruses include whether they are cells, the presence or absence of a nucleus and size.