1. KEY CONCEPT Science is a way of thinking, questioning, and gathering evidence.

2. Like all science, biology is a process of inquiry. Scientists make careful and systematic observations. Scientists test their hypotheses and analyze their data. Scientists form a hypothesis as a possible answer to a question based on observations. Scientists record observations as data. Use their senses. Creating an experiment Take data from experiment and figure out any trends What does my data mean? Was my hypothesis supported?

3. Biologists use experiments to test hypotheses. Observational studies allow scientists to describe a phenomenon.

4. Experiments allow scientists to determine what causes a phenomenon.

5. Independent variables are manipulated. Constants are conditions that are kept the same. Experimental studies allow scientists to determine what causes a phenomenon. Dependent variables are observed and measured. Controls - used as a comparison

6. A theory explains a wide range of observations. Theories explain a wide range of observations and experimental results. A theory is supported by a wide range of scientific evidence. Theories can change based on new evidence. Laws- what you observe in nature over and over.

7. KEY CONCEPT Section 4 Technology continually changes the way biologists work.

8. Imaging technologies provide new views of life. A microscope provides an enlarged image of an object. stoma light microscopes (LM) Image is or can be alive.

9. stoma scanning electron microscopes (SEM) Imaging technologies provide new views of life. A microscope provides an enlarged image of an object. light microscopes (LM) 3-D picture Not alive Enlarged outside of object.

10. transmission electron microscopes (TEM) stoma scanning electron microscopes (SEM) Imaging technologies provide new views of life. A microscope provides an enlarged image of an object. light microscopes (LM) Cut a slice out of the object Object not alive Object is extremely detailed

11. Imaging technology is used in medicine. X-ray images Shows bones. Passes through soft tissue only.

12. magnetic resonance imaging (MRI) Imaging technology is used in medicine. X-ray images Uses a strong magnetic field to produce a cross- section of the body.

13. functional MRI (fMRI) magnetic resonance imaging (MRI) Imaging technology is used in medicine. X-ray images Can show areas of the brain that are active while a person is doing a task.

14. Complex systems are modeled on computers. Computer models are used to study systems that cannot be studied directly. h eart attacks effect of medicines on the human body movement of water molecules into and out of a cell spread of a disease through a population Computer models are used when experiments are not safe, ethical, or practical. Normal heartbeat Heart attack

15. The tools of molecular genetics give rise to new biological studies. A gene is a segment of DNA that stores genetic information.

16. Through our understanding of DNA, we can study genetics on a molecular level. molecular genetics genomics The study and manipulation of DNA on a molecular level.