Honors Biology Chapter 2. The Science of Biology
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1 Honors Biology Chapter 2 The Science of Biology
2 Concept 2.1: Discovery Science Emphasizes Inquiry and Observation I. Science as Inquiry A. Science = to know, to answer? s about the natural world 1. 2 main forms of science investigation: a. Discovery Science = Describes Nature b. Hypothesis Based Science = Explains Nature
3 B. In Inquiry based Biology ask thoughtful? s, and then search for answers C. Takes talent to know what to ask!
4 II. Observations and Data A. Observation = use of senses to gather and record info B. Data = recorded observations C. Scientific instruments increase range of possible observations (telescopes, microscopes)
5 D. Two types of Data: 1. Quantitative Data = measurements, amounts (involves numbers) a. Ex. Height, length, temperature, how many, degrees, etc. 2. Qualitative Data = descriptions, sensory impressions a. Ex. Color, smell, taste, sound, behavioral observations
6 Data should be: clearly organized (tables, charts, graphs), consistently recorded, reliable
7 III. What is Discovery Science? A. It is Descriptive Science! 1.Ex. Jane Goodall and Chimpanzees, collecting and id ing orgs in river, describing cells seen under a microscope, etc. 2. Can occur entirely by accident, too! - Ex. Alexander Fleming s discover of penicillin (Read p. 26)
8 B. Inference = logical conclusion based on observations 1. Help refine general? s into specific? s to explore further a. Ex. Something in the mold prevented the bacterial growth in Fleming s culture 2. Good inference does not stretch too far beyond the data 3. Ex. Inference exercise: photo p. 27
9 C. Generalization = broad conclusion based on many specific observation put together 1. Ex. All living things made of cells generalized from observing cells in all type of samples from many types of orgs. 2. Can also be made from quantitative data (graph of boy vs. girl height p. 28)
10 D. Discovery science often leads to Hypothesis based Science! to test if generalizations and inferences are true, and to determine causes of some discoveries!
11 Concept 2.2: Hypothesis Based Science is a Search for Explanations I. Methods of Hypothesis Based Science A. Scientific Method: a plan of attack, not always completely followed! (Read p.30) 1. Diagram p. 30: Observation, Question, Hypothesis, Prediction, Test (Replicate, Report) a. PHEAC, R2
12 B. Hypothesis = suggested answer to a well-defined scientific? (Or: an explanation on trial) 1. Should allow you to make predictions in an If then.. format 2. Ex. Dead flashlight p. 31
13 C. Case Study of Hypothesis Based Science Read p Controlled Experiment = tests the effects of a single variable only a. Variable = condition that can vary within an experiment b. Eliminating unwanted variables done by: dividing test subjects into 2 groups 1.) Experimental group 2.) Control group 3.) Constant = all variables that are kept the same for all groups in the experiment
14 2. Organizing Data and Interpreting Results a. Quantitative Data more easily interpreted in chart and/or graph form 1.) Graphs useful in seeing trends at a glance 2.) Ex. Graph p. 35
15 Concept 2.3: Understanding Science will help You Evaluate many Issues I. Evidence = (in science) collected body of data from observations and experiments A. Must be repeated multiple times with similar results for scientists to accept it as valid. B. Useful to evaluate everything from ads for food supplements, to miracle cures
16 II. What makes a hypothesis scientific? A. Must be testable, otherwise worthless! B. Can either be supported or contradicted by an experiment (Is it falsifiable ) C. Scientific hypotheses may be rejected later, esp. with new equipment advances. 1. Ex. Fungi once thought closely related to plants, but DNA technology refutes that idea now.
17 III. Limitations of Science A. Restricted to natural causes for natural phenomena 1. Many things cannot be tested scientifically a. Ex. Cannot prove/disprove with science that rainbows, storms, etc. caused by unobservable or supernatural forces
18 2. Not everything you know is based on science, either a. Ex. You know what type of music you like, what your favorite color is, etc. b. Ex. You know right from wrong ethical value
19 IV. Theories A. Theory = well-tested explanation that makes sense of a great variety of scientific observations (ties together many different sets of observations and data) 1. Can result in many different hypotheses that can be tested a. Ex. Theory of Natural Selection explains many different adaptations of orgs. to envir. 2. Can be modified or replaced with new evidence
20 V. Models A. Model = physical, mental or mathematical representation of how people understand a process or idea 1. Ex. Drawing, graph, 3-D object, computer program, math equation, or verbal description or analogy of how process works 2. Judge value of models on: does it explain, can it help predict, does it match new observations? - 3. Poor models don t last
21 VI. Communication in Science A. Scientists rarely work alone (unlike movie sci.) B. Communicate by: journal articles, giving talks at meetings, internet communication, etc. C. Competition/Cooperation driving forces 1. Ex. Race to map the human genome (not in text)
22 VII. Science, Technology and Society A. Technology s Goal = to apply science to a specific purpose 1. Scientists (biologists, ex.) make discoveries 2. Technologists (engineers, ex.) create inventions
23 Examples of Technology 3. Ex. Watson and Crick discovered structure of DNA molecule Medical Technologists working to cure diseases with recombinant DNA technology 4. *Technology often driven by current human needs and values. Ex. Should people be tested for genes for diseases? Should we perform stem cell research to cure disease? Notice: not can it be done but, should it be done?
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