Biology

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Biology Mid-Term Exam Review 2012 – 13

ANSWERKEY

Chapter 1

1. The science or study of life is called Biology.

2. Define biosphere: part of the Earth where all organisms live.

3. Define ecosystem: organisms and the non-living factors in an area.

4. Define population: a group of the same species in an area.

5. List the 8 characteristics of life (Is virus a living thing? – NO)

1. made of at least one cell

2. reproduce

3. based on universal genetic code (have DNA and/or RNA)

4. grow and/or develop

5. obtain and use energy

6. respond to their environment

7. maintain stable internal environment (homeostasis)

8. evolve over time (as a group)

6. What is the smallest unit of life capable of carrying out all life functions? cell

7. Several tissues together make up an organ.

8. A red blood cell is an example of what level of organization? cellular

9. What microscope is used to view the internal structures of a specimen? Transmission Electron Microscope (TEM)

10. What microscope shows 3D surface structures? Scanning Electron Microscope (SEM)

11. Which microscope uses a beam of electrons to make a specimen visible? Electron Microscope

12. What happens to the field of view of a microscope as the magnification increases? It decreases

13. List the function of the following microscope parts:

a. stage – holds specimen or slide

b. eyepiece – lens you look through to view specimen (ocular lens)

c. diaphragm – adjusts amount of light

d. objective lens – increases or decreases magnification

e. revolving nosepiece – turns objective lens

14. List the magnification of the following:

a. eyepiece 10x

b. low power objective lens x eyepiece 4 x 10 = 40

c. high power...