1. Biology: Science of Life Ch.1

2. (1-1) Characteristics of Life 1.Organization & Cells 2.Response to Stimuli 3.Homeostasis 4.Metabolism 5.Growth & Development 6.Reproduction 7.Change thru Time

3. Organization Cells: basic unit of life Tissues: groups of cells w/ similar functions –Muscle tissue Organs: tissues carry out specialized jobs –Lung Organ Systems: organs that work together to perform a task –Respiratory system

6. Cell Structure & Function Unicellular: 1 cell –Bacteria Multicellular: many cells –Humans Differentiation: cells become specialized

9. Response to Stimuli Stimulus: change in the internal or external environment –Dilating pupils

10. Homeostasis Stable internal conditions Ex: –Temperature Ex: Thermostat –Water intake –Food intake –pH

11. Metabolism Sum of all chemical rxns that take in & transform E & materials from the environment Photosynthesis: converts light E into chemical E Cellular Respiration: converts organic cmpds into usable E (ATP)

13. Growth & Development Cell division: formation of 2 cells from an existing cell Development: process by which an organism grows –Repeated cell divisions & differentiation

15. Reproduction DNA (deoxyribonucleic acid): large molecule of hereditary info Gene: segment of DNA that contains instructions for development of a single trait Sexual (2  1) vs. Asexual (1  2) reproduction

16. Change Thru Time Evolution

18. (1-2) Themes of Biology 3 major themes 1.Diversity & Unity of Life 2.Interdependence of Organisms 3.Evolution of Life

19. Diversity & Unity of Life All living things have in common: –Genetic code –Tree of Life (lineages) 3 domains 6 kingdoms

20. Interdependence of Organisms Ecology: study of the relationship b/w organisms & their environment Ecosystem: all the biotic & abiotic (nonliving) components of an environment

21. Evolution of Life Adaptations: traits that improve ability to survive & reproduce Natural selection: organisms w/ favorable traits reproduce at higher rates than those w/out such traits –“Survival of the fittest”

22. (1-3) Scientific Method 1.Observe 2.Hypothesize Explains observations & data & can be tested (“if, then”) 3.Predict 4.Experiment Qualitative vs. quantitative (#’s) data 5.Communicate –Theorize: well-tested explanation of observations

23. Experiment Variables Control group: standard –Hunts in light Experimental group: identical to control except 1 factor –Hunts in dark Independent variable: manipulated variable –Amount of light Dependent variable: responding variable –Distance of owl’s strike

25. (1-4) Microscopes Instrument that produces an enlarged image of an object Ex: –Light (living) –Electron (nonliving)

26. Measurement SI: standard system of measurement used by scientists Base units: 7 fundamental SI units –Length: m –Mass: kg –Time: second