Do Now

1. Do Now • What is the scientific method? (use your notes)

2. Unit 1 The Nature of Life Ch. 1 The Science of Biology

3. What Science Is and Is Not • The goal of science is to investigate & understand the natural world, to explain events in the natural world, & to use those explanations to make useful predictions

4. What is Science? • Science – an organized way of using evidence to learn about the natural world

5. Thinking Like a Scientist • Observation – process of gathering info about events or processes • Data – info gathered from observations • Inference – an interpretation based on prior knowledge or experience

6. Explaining & Interpreting Evidence • Hypotheses– a proposed scientific explanation for a set of observations (if…then…)

7. Designing an Experiment • 1. Ask a question • 2. Form a hypothesis • 3. Set up a controlled experiment • Controlled experiment – where only 1 variable is tested at a time, everything else is kept constant

8. Designing an Experiment • 4. Record & analyze results • 5. Draw a conclusion

10. Building Science Skills Recall a common superstition, such as the one that proposes that a black cat crossing your path brings bad luck or your own. • How would you use an experiment to verify or disprove this superstition. • Using the steps on the next slide. • Work in groups of three and design an experiment using the scientific method • Write steps in your NUA notebook and leave room to write a response to each step

11. Scientific Method Steps • Ask a question • Form a hypothesis • Set up a controlled experiment • Record and analyze data • Draw a Conclusion

12. 1-1 Section Assessment Write in your NUA notebook • Get your textbook on the book shelve • Go to page 7 in your textbook • Answer questions 1, 3, 4 and 5 Homework (definitions of terms) Vocabulary: Spontaneous Generation, Controlled Experiment, Manipulated Variable, Responding Variable & Theory

13. Do Now List the 5 steps of the scientific method

14. How a Theory Develops • As evidence from many investigations builds up, a hypothesis may become so well supported that scientists consider it a theory

15. Characteristics of Living Things • Biology – the study of life • Living things share The following 8 characteristics: • 1. Made up of cells • 2. Reproduce • 3. Based on a universal genetic code • 4. Grow & Develop

16. Characteristics of Living Things • 5. Obtain & use materials & energy • 6. Respond to their environment • 7. Maintain a stable internal environment • 8. As a group, living things change over time

17. Characteristics of Living ThingsLab (write in your NUA notebook) Work in groups of 2 and examine the 2 pictures on the next slide. Car Cat Compare the two, noting similarities and differences. Collaborate using the characteristics of living things to write a paragraph explaining what makes the picture a living thing and the other not.

18. Pictures

19. Made Up of Cells • Cell – a collection of living matter enclosed by a barrier that separates the cell from its surroundings • They can grow, respond to surroundings, & reproduce

20. Reproduction • Sexual reproduction – 2 parents produce offspring • Asexual reproduction – 1 parent produces offspring

21. There are two organisms shown in the photo, which organism represents sexual reproduction? Why does the other organism not represent sexual reproduction?

22. Based on a Genetic Code • DNA (deoxyribonucleic acid) – molecule that carries directions for inheritance, for every organism on Earth

23. Growth & Development • All living things grow during at least part of their lives

24. Need for Materials & Energy • Metabolism – all the chemical reactions that take place within an organism, to carry out life processes, which requires energy

25. Response to the Environment • Stimulus – a signal that an organism responds to • Ex.) when there is enough water, & the ground is warm enough, a plant seed responds by germinating

26. Maintaining Internal Balance • Homeostasis – maintaining a stable internal environment, such as temperature & water content

27. Evolution • As a group, any given kind of organism can evolve, or change over time

28. Branches of Biology • Some of the levels that life can be studied include molecules, cells, organisms, populations of a single kind of organism, communities of different organisms in an area, & the biosphere • At all of these levels, smaller living systems are found within larger systems

30. Complete flow chart of the Level of Organization (Page 21 textbook) Start with the broadest level on top and work you way down to the smallest level. Fill in __________ All ecosytems Ecosystem________ Fill in Fill in___________ Population in a defined area Population______ Fill in Fill in_________ Individual living things Groups of cells Fill in Fill In______ Smallest functional unit of life Molecule_ Fill In

31. 1-2 Section Assessment Write in your NUA notebook • Get your textbook on the book shelve • Go to page 15 in your textbook • Answer questions 1, 2, 3 and 4 Homework (definitions of terms) Vocabulary: biology, cell, sexual reproduction, asexual reproduction, metabolism, stimulus, homeostasis and evolution.

32. Do Now What is the difference between sexual reproduction and asexual reproduction?

33. A Common Measurement System • Most scientists use the metric system when collecting data & performing experiments • Metric system – International System of Units, or SI

34. Microscopes • Microscopes – devices that produce magnified images of structures that are too small to see with the naked eye

35. Light Microscopes • Compound Light Microscope – produce a magnified image by focusing visible light rays

36. Electron Microscopes • Electron microscopes – produce magnified images by focusing beams of electrons

37. Electron Microscopes • The best electron microscopes can produce images almost 1000 times more detailed than light microscopes can

38. **Remember B.U.B. • Objects, when viewed under a microscope, appear: Bigger, Upside down, & Backwards